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Finding the Fourth Proportional to 1,118.53, 1,543.56 and 621.17

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Solution

The fourth proportional to 1,118.53, 1,543.56 and 621.17 is: 857.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.53 : 1,543.56 = 621.17 : x
  2. Step 2: Convert to fraction form
    1,118.53/1,543.56 = 621.17/x
  3. Step 3: Cross multiply
    1,118.53x = 1,543.56 × 621.17
  4. Step 4: Simplify right side
    1,118.53x = 958,808.91
  5. Step 5: Solve for x
    x = 958,808.91/1,118.53
  6. Step 6: Final answer
    x = 857.21

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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.