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Finding the Fourth Proportional to 1,000.78, 1,381.12 and 581.13

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Solution

The fourth proportional to 1,000.78, 1,381.12 and 581.13 is: 801.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.78 : 1,381.12 = 581.13 : x
  2. Step 2: Convert to fraction form
    1,000.78/1,381.12 = 581.13/x
  3. Step 3: Cross multiply
    1,000.78x = 1,381.12 × 581.13
  4. Step 4: Simplify right side
    1,000.78x = 802,608.81
  5. Step 5: Solve for x
    x = 802,608.81/1,000.78
  6. Step 6: Final answer
    x = 801.99

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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.