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Finding the Fourth Proportional to 572,078.40, 857,728.80 and 217,039.20

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Solution

The fourth proportional to 572,078.40, 857,728.80 and 217,039.20 is: 325,411.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,078.40 : 857,728.80 = 217,039.20 : x
  2. Step 2: Convert to fraction form
    572,078.40/857,728.80 = 217,039.20/x
  3. Step 3: Cross multiply
    572,078.40x = 857,728.80 × 217,039.20
  4. Step 4: Simplify right side
    572,078.40x = 186,160,772,568.96
  5. Step 5: Solve for x
    x = 186,160,772,568.96/572,078.40
  6. Step 6: Final answer
    x = 325,411.29

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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.