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Finding the Fourth Proportional to 153,781.28, 212,239.36 and 90,144.48

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Solution

The fourth proportional to 153,781.28, 212,239.36 and 90,144.48 is: 124,411.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,781.28 : 212,239.36 = 90,144.48 : x
  2. Step 2: Convert to fraction form
    153,781.28/212,239.36 = 90,144.48/x
  3. Step 3: Cross multiply
    153,781.28x = 212,239.36 × 90,144.48
  4. Step 4: Simplify right side
    153,781.28x = 19,132,206,742.73
  5. Step 5: Solve for x
    x = 19,132,206,742.73/153,781.28
  6. Step 6: Final answer
    x = 124,411.81

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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.