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Finding the Fourth Proportional to 128,140.64, 176,838 and 71,554.40

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Solution

The fourth proportional to 128,140.64, 176,838 and 71,554.40 is: 98,747.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,140.64 : 176,838 = 71,554.40 : x
  2. Step 2: Convert to fraction form
    128,140.64/176,838 = 71,554.40/x
  3. Step 3: Cross multiply
    128,140.64x = 176,838 × 71,554.40
  4. Step 4: Simplify right side
    128,140.64x = 12,653,536,987.20
  5. Step 5: Solve for x
    x = 12,653,536,987.20/128,140.64
  6. Step 6: Final answer
    x = 98,747.26

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1.5x scale

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.