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Finding the Fourth Proportional to 987.41, 1,363.73 and 655.25

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Solution

The fourth proportional to 987.41, 1,363.73 and 655.25 is: 904.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.41 : 1,363.73 = 655.25 : x
  2. Step 2: Convert to fraction form
    987.41/1,363.73 = 655.25/x
  3. Step 3: Cross multiply
    987.41x = 1,363.73 × 655.25
  4. Step 4: Simplify right side
    987.41x = 893,589.13
  5. Step 5: Solve for x
    x = 893,589.13/987.41
  6. Step 6: Final answer
    x = 904.99

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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.