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Finding the Fourth Proportional to 647,534.20, 971,301.30 and 423,585.40

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Solution

The fourth proportional to 647,534.20, 971,301.30 and 423,585.40 is: 635,378.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,534.20 : 971,301.30 = 423,585.40 : x
  2. Step 2: Convert to fraction form
    647,534.20/971,301.30 = 423,585.40/x
  3. Step 3: Cross multiply
    647,534.20x = 971,301.30 × 423,585.40
  4. Step 4: Simplify right side
    647,534.20x = 411,429,049,681.02
  5. Step 5: Solve for x
    x = 411,429,049,681.02/647,534.20
  6. Step 6: Final answer
    x = 635,378.10

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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.