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Finding the Fourth Proportional to 991.12, 1,487.74 and 504.04

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Solution

The fourth proportional to 991.12, 1,487.74 and 504.04 is: 756.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.12 : 1,487.74 = 504.04 : x
  2. Step 2: Convert to fraction form
    991.12/1,487.74 = 504.04/x
  3. Step 3: Cross multiply
    991.12x = 1,487.74 × 504.04
  4. Step 4: Simplify right side
    991.12x = 749,880.47
  5. Step 5: Solve for x
    x = 749,880.47/991.12
  6. Step 6: Final answer
    x = 756.60

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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.