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Finding the Fourth Proportional to 116,688, 161,030.25 and 66,387

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Solution

The fourth proportional to 116,688, 161,030.25 and 66,387 is: 91,614.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    116,688 : 161,030.25 = 66,387 : x
  2. Step 2: Convert to fraction form
    116,688/161,030.25 = 66,387/x
  3. Step 3: Cross multiply
    116,688x = 161,030.25 × 66,387
  4. Step 4: Simplify right side
    116,688x = 10,690,315,206.75
  5. Step 5: Solve for x
    x = 10,690,315,206.75/116,688
  6. Step 6: Final answer
    x = 91,614.52

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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.