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Finding the Fourth Proportional to 478,421.10, 717,631.65 and 319,790.70

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Solution

The fourth proportional to 478,421.10, 717,631.65 and 319,790.70 is: 479,686.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,421.10 : 717,631.65 = 319,790.70 : x
  2. Step 2: Convert to fraction form
    478,421.10/717,631.65 = 319,790.70/x
  3. Step 3: Cross multiply
    478,421.10x = 717,631.65 × 319,790.70
  4. Step 4: Simplify right side
    478,421.10x = 229,491,927,695.66
  5. Step 5: Solve for x
    x = 229,491,927,695.66/478,421.10
  6. Step 6: Final answer
    x = 479,686.05

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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.