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Finding the Fourth Proportional to 642,128.30, 886,732.71 and 480,703.10

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Solution

The fourth proportional to 642,128.30, 886,732.71 and 480,703.10 is: 663,816.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,128.30 : 886,732.71 = 480,703.10 : x
  2. Step 2: Convert to fraction form
    642,128.30/886,732.71 = 480,703.10/x
  3. Step 3: Cross multiply
    642,128.30x = 886,732.71 × 480,703.10
  4. Step 4: Simplify right side
    642,128.30x = 426,255,162,568.40
  5. Step 5: Solve for x
    x = 426,255,162,568.40/642,128.30
  6. Step 6: Final answer
    x = 663,816.19

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.