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Finding the Fourth Proportional to 630,411.20, 945,616.80 and 431,345.60

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Solution

The fourth proportional to 630,411.20, 945,616.80 and 431,345.60 is: 647,018.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,411.20 : 945,616.80 = 431,345.60 : x
  2. Step 2: Convert to fraction form
    630,411.20/945,616.80 = 431,345.60/x
  3. Step 3: Cross multiply
    630,411.20x = 945,616.80 × 431,345.60
  4. Step 4: Simplify right side
    630,411.20x = 407,887,645,966.08
  5. Step 5: Solve for x
    x = 407,887,645,966.08/630,411.20
  6. Step 6: Final answer
    x = 647,018.40

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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.