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Finding the Fourth Proportional to 478,354.40, 718,600.80 and 399,622.40

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Solution

The fourth proportional to 478,354.40, 718,600.80 and 399,622.40 is: 600,326.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,354.40 : 718,600.80 = 399,622.40 : x
  2. Step 2: Convert to fraction form
    478,354.40/718,600.80 = 399,622.40/x
  3. Step 3: Cross multiply
    478,354.40x = 718,600.80 × 399,622.40
  4. Step 4: Simplify right side
    478,354.40x = 287,168,976,337.92
  5. Step 5: Solve for x
    x = 287,168,976,337.92/478,354.40
  6. Step 6: Final answer
    x = 600,326.82

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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.