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Finding the Fourth Proportional to 917,689.20, 1,376,728.20 and 277,940.40

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Solution

The fourth proportional to 917,689.20, 1,376,728.20 and 277,940.40 is: 416,969.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,689.20 : 1,376,728.20 = 277,940.40 : x
  2. Step 2: Convert to fraction form
    917,689.20/1,376,728.20 = 277,940.40/x
  3. Step 3: Cross multiply
    917,689.20x = 1,376,728.20 × 277,940.40
  4. Step 4: Simplify right side
    917,689.20x = 382,648,386,599.28
  5. Step 5: Solve for x
    x = 382,648,386,599.28/917,689.20
  6. Step 6: Final answer
    x = 416,969.48

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.