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Finding the Fourth Proportional to 1,118.57, 1,543.52 and 621.20

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Solution

The fourth proportional to 1,118.57, 1,543.52 and 621.20 is: 857.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.57 : 1,543.52 = 621.20 : x
  2. Step 2: Convert to fraction form
    1,118.57/1,543.52 = 621.20/x
  3. Step 3: Cross multiply
    1,118.57x = 1,543.52 × 621.20
  4. Step 4: Simplify right side
    1,118.57x = 958,823.80
  5. Step 5: Solve for x
    x = 958,823.80/1,118.57
  6. Step 6: Final answer
    x = 857.19

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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.