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Finding the Fourth Proportional to 991.44, 1,487.76 and 581.40

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Solution

The fourth proportional to 991.44, 1,487.76 and 581.40 is: 872.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.44 : 1,487.76 = 581.40 : x
  2. Step 2: Convert to fraction form
    991.44/1,487.76 = 581.40/x
  3. Step 3: Cross multiply
    991.44x = 1,487.76 × 581.40
  4. Step 4: Simplify right side
    991.44x = 864,983.66
  5. Step 5: Solve for x
    x = 864,983.66/991.44
  6. Step 6: Final answer
    x = 872.45

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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.