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Finding the Fourth Proportional to 987.81, 1,479.18 and 958.61

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Solution

The fourth proportional to 987.81, 1,479.18 and 958.61 is: 1,435.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.81 : 1,479.18 = 958.61 : x
  2. Step 2: Convert to fraction form
    987.81/1,479.18 = 958.61/x
  3. Step 3: Cross multiply
    987.81x = 1,479.18 × 958.61
  4. Step 4: Simplify right side
    987.81x = 1,417,949.34
  5. Step 5: Solve for x
    x = 1,417,949.34/987.81
  6. Step 6: Final answer
    x = 1,435.45

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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.