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Finding the Fourth Proportional to 128,116.72, 176,816.08 and 74,404

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Solution

The fourth proportional to 128,116.72, 176,816.08 and 74,404 is: 102,686.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,116.72 : 176,816.08 = 74,404 : x
  2. Step 2: Convert to fraction form
    128,116.72/176,816.08 = 74,404/x
  3. Step 3: Cross multiply
    128,116.72x = 176,816.08 × 74,404
  4. Step 4: Simplify right side
    128,116.72x = 13,155,823,616.32
  5. Step 5: Solve for x
    x = 13,155,823,616.32/128,116.72
  6. Step 6: Final answer
    x = 102,686.23

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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.