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Finding the Fourth Proportional to 987.77, 1,363.12 and 539.67

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Solution

The fourth proportional to 987.77, 1,363.12 and 539.67 is: 744.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.77 : 1,363.12 = 539.67 : x
  2. Step 2: Convert to fraction form
    987.77/1,363.12 = 539.67/x
  3. Step 3: Cross multiply
    987.77x = 1,363.12 × 539.67
  4. Step 4: Simplify right side
    987.77x = 735,634.97
  5. Step 5: Solve for x
    x = 735,634.97/987.77
  6. Step 6: Final answer
    x = 744.74

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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.