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Finding the Fourth Proportional to 66,390.59, 99,622.34 and 31,329.33

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Solution

The fourth proportional to 66,390.59, 99,622.34 and 31,329.33 is: 47,011.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,390.59 : 99,622.34 = 31,329.33 : x
  2. Step 2: Convert to fraction form
    66,390.59/99,622.34 = 31,329.33/x
  3. Step 3: Cross multiply
    66,390.59x = 99,622.34 × 31,329.33
  4. Step 4: Simplify right side
    66,390.59x = 3,121,101,008.59
  5. Step 5: Solve for x
    x = 3,121,101,008.59/66,390.59
  6. Step 6: Final answer
    x = 47,011.20

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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.