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Finding the Fourth Proportional to 987.69, 1,363.05 and 738.57

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Solution

The fourth proportional to 987.69, 1,363.05 and 738.57 is: 1,019.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.69 : 1,363.05 = 738.57 : x
  2. Step 2: Convert to fraction form
    987.69/1,363.05 = 738.57/x
  3. Step 3: Cross multiply
    987.69x = 1,363.05 × 738.57
  4. Step 4: Simplify right side
    987.69x = 1,006,707.84
  5. Step 5: Solve for x
    x = 1,006,707.84/987.69
  6. Step 6: Final answer
    x = 1,019.25

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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.