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Finding the Fourth Proportional to 99.34, 148.29 and 87.19

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Solution

The fourth proportional to 99.34, 148.29 and 87.19 is: 130.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.34 : 148.29 = 87.19 : x
  2. Step 2: Convert to fraction form
    99.34/148.29 = 87.19/x
  3. Step 3: Cross multiply
    99.34x = 148.29 × 87.19
  4. Step 4: Simplify right side
    99.34x = 12,928.71
  5. Step 5: Solve for x
    x = 12,928.71/99.34
  6. Step 6: Final answer
    x = 130.15

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.