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Finding the Fourth Proportional to 991.64, 1,487.16 and 374.88

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Solution

The fourth proportional to 991.64, 1,487.16 and 374.88 is: 562.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.64 : 1,487.16 = 374.88 : x
  2. Step 2: Convert to fraction form
    991.64/1,487.16 = 374.88/x
  3. Step 3: Cross multiply
    991.64x = 1,487.16 × 374.88
  4. Step 4: Simplify right side
    991.64x = 557,506.54
  5. Step 5: Solve for x
    x = 557,506.54/991.64
  6. Step 6: Final answer
    x = 562.21

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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.