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Finding the Fourth Proportional to 78,489.55, 117,663.11 and 28,534.36

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Solution

The fourth proportional to 78,489.55, 117,663.11 and 28,534.36 is: 42,775.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.55 : 117,663.11 = 28,534.36 : x
  2. Step 2: Convert to fraction form
    78,489.55/117,663.11 = 28,534.36/x
  3. Step 3: Cross multiply
    78,489.55x = 117,663.11 × 28,534.36
  4. Step 4: Simplify right side
    78,489.55x = 3,357,441,539.46
  5. Step 5: Solve for x
    x = 3,357,441,539.46/78,489.55
  6. Step 6: Final answer
    x = 42,775.65

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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.