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Finding the Fourth Proportional to 72,987.48, 100,725.21 and 42,358.22

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Solution

The fourth proportional to 72,987.48, 100,725.21 and 42,358.22 is: 58,455.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,987.48 : 100,725.21 = 42,358.22 : x
  2. Step 2: Convert to fraction form
    72,987.48/100,725.21 = 42,358.22/x
  3. Step 3: Cross multiply
    72,987.48x = 100,725.21 × 42,358.22
  4. Step 4: Simplify right side
    72,987.48x = 4,266,540,604.73
  5. Step 5: Solve for x
    x = 4,266,540,604.73/72,987.48
  6. Step 6: Final answer
    x = 58,455.79

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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.