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Finding the Fourth Proportional to 429,785.40, 644,678.10 and 393,043.80

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Solution

The fourth proportional to 429,785.40, 644,678.10 and 393,043.80 is: 589,565.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,785.40 : 644,678.10 = 393,043.80 : x
  2. Step 2: Convert to fraction form
    429,785.40/644,678.10 = 393,043.80/x
  3. Step 3: Cross multiply
    429,785.40x = 644,678.10 × 393,043.80
  4. Step 4: Simplify right side
    429,785.40x = 253,386,730,200.78
  5. Step 5: Solve for x
    x = 253,386,730,200.78/429,785.40
  6. Step 6: Final answer
    x = 589,565.70

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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.