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Finding the Fourth Proportional to 991.59, 1,487.72 and 375.47

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Solution

The fourth proportional to 991.59, 1,487.72 and 375.47 is: 563.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.59 : 1,487.72 = 375.47 : x
  2. Step 2: Convert to fraction form
    991.59/1,487.72 = 375.47/x
  3. Step 3: Cross multiply
    991.59x = 1,487.72 × 375.47
  4. Step 4: Simplify right side
    991.59x = 558,593.31
  5. Step 5: Solve for x
    x = 558,593.31/991.59
  6. Step 6: Final answer
    x = 563.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.