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Finding the Fourth Proportional to 1,000.89, 1,381.16 and 558.83

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Solution

The fourth proportional to 1,000.89, 1,381.16 and 558.83 is: 771.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.89 : 1,381.16 = 558.83 : x
  2. Step 2: Convert to fraction form
    1,000.89/1,381.16 = 558.83/x
  3. Step 3: Cross multiply
    1,000.89x = 1,381.16 × 558.83
  4. Step 4: Simplify right side
    1,000.89x = 771,838.49
  5. Step 5: Solve for x
    x = 771,838.49/1,000.89
  6. Step 6: Final answer
    x = 771.15

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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.