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Finding the Fourth Proportional to 128,061.90, 191,655.45 and 117,564.30

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Solution

The fourth proportional to 128,061.90, 191,655.45 and 117,564.30 is: 175,944.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,061.90 : 191,655.45 = 117,564.30 : x
  2. Step 2: Convert to fraction form
    128,061.90/191,655.45 = 117,564.30/x
  3. Step 3: Cross multiply
    128,061.90x = 191,655.45 × 117,564.30
  4. Step 4: Simplify right side
    128,061.90x = 22,531,838,820.44
  5. Step 5: Solve for x
    x = 22,531,838,820.44/128,061.90
  6. Step 6: Final answer
    x = 175,944.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.