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Finding the Fourth Proportional to 647,807.40, 971,711.10 and 423,421.20

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Solution

The fourth proportional to 647,807.40, 971,711.10 and 423,421.20 is: 635,131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,807.40 : 971,711.10 = 423,421.20 : x
  2. Step 2: Convert to fraction form
    647,807.40/971,711.10 = 423,421.20/x
  3. Step 3: Cross multiply
    647,807.40x = 971,711.10 × 423,421.20
  4. Step 4: Simplify right side
    647,807.40x = 411,443,080,015.32
  5. Step 5: Solve for x
    x = 411,443,080,015.32/647,807.40
  6. Step 6: Final answer
    x = 635,131.80

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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.