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Finding the Fourth Proportional to 1,129.50, 1,559.20 and 810.70

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Solution

The fourth proportional to 1,129.50, 1,559.20 and 810.70 is: 1,119.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.50 : 1,559.20 = 810.70 : x
  2. Step 2: Convert to fraction form
    1,129.50/1,559.20 = 810.70/x
  3. Step 3: Cross multiply
    1,129.50x = 1,559.20 × 810.70
  4. Step 4: Simplify right side
    1,129.50x = 1,264,044.53
  5. Step 5: Solve for x
    x = 1,264,044.53/1,129.50
  6. Step 6: Final answer
    x = 1,119.12

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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.