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Finding the Fourth Proportional to 1,152.10, 1,728.15 and 892.90

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Solution

The fourth proportional to 1,152.10, 1,728.15 and 892.90 is: 1,339.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.10 : 1,728.15 = 892.90 : x
  2. Step 2: Convert to fraction form
    1,152.10/1,728.15 = 892.90/x
  3. Step 3: Cross multiply
    1,152.10x = 1,728.15 × 892.90
  4. Step 4: Simplify right side
    1,152.10x = 1,543,065.14
  5. Step 5: Solve for x
    x = 1,543,065.14/1,152.10
  6. Step 6: Final answer
    x = 1,339.35

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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.