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Finding the Fourth Proportional to 134,556, 185,687.28 and 74,940

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Solution

The fourth proportional to 134,556, 185,687.28 and 74,940 is: 103,417.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    134,556 : 185,687.28 = 74,940 : x
  2. Step 2: Convert to fraction form
    134,556/185,687.28 = 74,940/x
  3. Step 3: Cross multiply
    134,556x = 185,687.28 × 74,940
  4. Step 4: Simplify right side
    134,556x = 13,915,404,763.20
  5. Step 5: Solve for x
    x = 13,915,404,763.20/134,556
  6. Step 6: Final answer
    x = 103,417.20

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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.