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Finding the Fourth Proportional to 987.16, 1,363.42 and 655

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Solution

The fourth proportional to 987.16, 1,363.42 and 655 is: 904.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.16 : 1,363.42 = 655 : x
  2. Step 2: Convert to fraction form
    987.16/1,363.42 = 655/x
  3. Step 3: Cross multiply
    987.16x = 1,363.42 × 655
  4. Step 4: Simplify right side
    987.16x = 893,040.10
  5. Step 5: Solve for x
    x = 893,040.10/987.16
  6. Step 6: Final answer
    x = 904.66

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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.