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Finding the Fourth Proportional to 987.16, 1,361.50 and 613.92

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Solution

The fourth proportional to 987.16, 1,361.50 and 613.92 is: 846.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.16 : 1,361.50 = 613.92 : x
  2. Step 2: Convert to fraction form
    987.16/1,361.50 = 613.92/x
  3. Step 3: Cross multiply
    987.16x = 1,361.50 × 613.92
  4. Step 4: Simplify right side
    987.16x = 835,849.01
  5. Step 5: Solve for x
    x = 835,849.01/987.16
  6. Step 6: Final answer
    x = 846.72

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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.