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Finding the Fourth Proportional to 1,118.38, 1,543.33 and 621.00

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Solution

The fourth proportional to 1,118.38, 1,543.33 and 621.00 is: 856.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.38 : 1,543.33 = 621.00 : x
  2. Step 2: Convert to fraction form
    1,118.38/1,543.33 = 621.00/x
  3. Step 3: Cross multiply
    1,118.38x = 1,543.33 × 621.00
  4. Step 4: Simplify right side
    1,118.38x = 958,411.79
  5. Step 5: Solve for x
    x = 958,411.79/1,118.38
  6. Step 6: Final answer
    x = 856.97

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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.