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Finding the Fourth Proportional to 999.47, 1,379.76 and 774.90

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Solution

The fourth proportional to 999.47, 1,379.76 and 774.90 is: 1,069.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.47 : 1,379.76 = 774.90 : x
  2. Step 2: Convert to fraction form
    999.47/1,379.76 = 774.90/x
  3. Step 3: Cross multiply
    999.47x = 1,379.76 × 774.90
  4. Step 4: Simplify right side
    999.47x = 1,069,169.13
  5. Step 5: Solve for x
    x = 1,069,169.13/999.47
  6. Step 6: Final answer
    x = 1,069.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.