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Finding the Fourth Proportional to 1,118.49, 1,543.41 and 621.15

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Solution

The fourth proportional to 1,118.49, 1,543.41 and 621.15 is: 857.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.49 : 1,543.41 = 621.15 : x
  2. Step 2: Convert to fraction form
    1,118.49/1,543.41 = 621.15/x
  3. Step 3: Cross multiply
    1,118.49x = 1,543.41 × 621.15
  4. Step 4: Simplify right side
    1,118.49x = 958,689.12
  5. Step 5: Solve for x
    x = 958,689.12/1,118.49
  6. Step 6: Final answer
    x = 857.13

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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.