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Finding the Fourth Proportional to 991.12, 1,487.04 and 626.08

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Solution

The fourth proportional to 991.12, 1,487.04 and 626.08 is: 939.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.12 : 1,487.04 = 626.08 : x
  2. Step 2: Convert to fraction form
    991.12/1,487.04 = 626.08/x
  3. Step 3: Cross multiply
    991.12x = 1,487.04 × 626.08
  4. Step 4: Simplify right side
    991.12x = 931,006.00
  5. Step 5: Solve for x
    x = 931,006.00/991.12
  6. Step 6: Final answer
    x = 939.35

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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.