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Finding the Fourth Proportional to 1,145.32, 1,720 and 852.90

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Solution

The fourth proportional to 1,145.32, 1,720 and 852.90 is: 1,280.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.32 : 1,720 = 852.90 : x
  2. Step 2: Convert to fraction form
    1,145.32/1,720 = 852.90/x
  3. Step 3: Cross multiply
    1,145.32x = 1,720 × 852.90
  4. Step 4: Simplify right side
    1,145.32x = 1,466,988
  5. Step 5: Solve for x
    x = 1,466,988/1,145.32
  6. Step 6: Final answer
    x = 1,280.85

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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.