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Finding the Fourth Proportional to 1,168.55, 1,752.61 and 428

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Solution

The fourth proportional to 1,168.55, 1,752.61 and 428 is: 641.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,168.55 : 1,752.61 = 428 : x
  2. Step 2: Convert to fraction form
    1,168.55/1,752.61 = 428/x
  3. Step 3: Cross multiply
    1,168.55x = 1,752.61 × 428
  4. Step 4: Simplify right side
    1,168.55x = 750,117.08
  5. Step 5: Solve for x
    x = 750,117.08/1,168.55
  6. Step 6: Final answer
    x = 641.92

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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.