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Finding the Fourth Proportional to 78,495.66, 108,324.12 and 42,685.56

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Solution

The fourth proportional to 78,495.66, 108,324.12 and 42,685.56 is: 58,906.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,495.66 : 108,324.12 = 42,685.56 : x
  2. Step 2: Convert to fraction form
    78,495.66/108,324.12 = 42,685.56/x
  3. Step 3: Cross multiply
    78,495.66x = 108,324.12 × 42,685.56
  4. Step 4: Simplify right side
    78,495.66x = 4,623,875,723.71
  5. Step 5: Solve for x
    x = 4,623,875,723.71/78,495.66
  6. Step 6: Final answer
    x = 58,906.13

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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.