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Finding the Fourth Proportional to 66,462.40, 99,693.60 and 19,715.20

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Solution

The fourth proportional to 66,462.40, 99,693.60 and 19,715.20 is: 29,572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,462.40 : 99,693.60 = 19,715.20 : x
  2. Step 2: Convert to fraction form
    66,462.40/99,693.60 = 19,715.20/x
  3. Step 3: Cross multiply
    66,462.40x = 99,693.60 × 19,715.20
  4. Step 4: Simplify right side
    66,462.40x = 1,965,479,262.72
  5. Step 5: Solve for x
    x = 1,965,479,262.72/66,462.40
  6. Step 6: Final answer
    x = 29,572.80

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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.