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Finding the Fourth Proportional to 478,658.03, 660,291.49 and 306,390.65

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Solution

The fourth proportional to 478,658.03, 660,291.49 and 306,390.65 is: 422,654.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,658.03 : 660,291.49 = 306,390.65 : x
  2. Step 2: Convert to fraction form
    478,658.03/660,291.49 = 306,390.65/x
  3. Step 3: Cross multiply
    478,658.03x = 660,291.49 × 306,390.65
  4. Step 4: Simplify right side
    478,658.03x = 202,307,138,810.57
  5. Step 5: Solve for x
    x = 202,307,138,810.57/478,658.03
  6. Step 6: Final answer
    x = 422,654.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.