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Finding the Fourth Proportional to 152.43, 210.15 and 99.87

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Solution

The fourth proportional to 152.43, 210.15 and 99.87 is: 137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.43 : 210.15 = 99.87 : x
  2. Step 2: Convert to fraction form
    152.43/210.15 = 99.87/x
  3. Step 3: Cross multiply
    152.43x = 210.15 × 99.87
  4. Step 4: Simplify right side
    152.43x = 20,987.68
  5. Step 5: Solve for x
    x = 20,987.68/152.43
  6. Step 6: Final answer
    x = 137.69

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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.