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Finding the Fourth Proportional to 478,836.30, 718,254.45 and 212,313.90

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Solution

The fourth proportional to 478,836.30, 718,254.45 and 212,313.90 is: 318,470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,836.30 : 718,254.45 = 212,313.90 : x
  2. Step 2: Convert to fraction form
    478,836.30/718,254.45 = 212,313.90/x
  3. Step 3: Cross multiply
    478,836.30x = 718,254.45 × 212,313.90
  4. Step 4: Simplify right side
    478,836.30x = 152,495,403,471.86
  5. Step 5: Solve for x
    x = 152,495,403,471.86/478,836.30
  6. Step 6: Final answer
    x = 318,470.85

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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.