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Finding the Fourth Proportional to 1,000.90, 1,381.10 and 581.29

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Solution

The fourth proportional to 1,000.90, 1,381.10 and 581.29 is: 802.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.90 : 1,381.10 = 581.29 : x
  2. Step 2: Convert to fraction form
    1,000.90/1,381.10 = 581.29/x
  3. Step 3: Cross multiply
    1,000.90x = 1,381.10 × 581.29
  4. Step 4: Simplify right side
    1,000.90x = 802,819.62
  5. Step 5: Solve for x
    x = 802,819.62/1,000.90
  6. Step 6: Final answer
    x = 802.10

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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.