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Finding the Fourth Proportional to 78,605.48, 117,864.12 and 69,266.72

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Solution

The fourth proportional to 78,605.48, 117,864.12 and 69,266.72 is: 103,861.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,605.48 : 117,864.12 = 69,266.72 : x
  2. Step 2: Convert to fraction form
    78,605.48/117,864.12 = 69,266.72/x
  3. Step 3: Cross multiply
    78,605.48x = 117,864.12 × 69,266.72
  4. Step 4: Simplify right side
    78,605.48x = 8,164,060,998.09
  5. Step 5: Solve for x
    x = 8,164,060,998.09/78,605.48
  6. Step 6: Final answer
    x = 103,861.22

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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.