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Finding the Fourth Proportional to 1,128.70, 1,559.73 and 814.92

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Solution

The fourth proportional to 1,128.70, 1,559.73 and 814.92 is: 1,126.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.70 : 1,559.73 = 814.92 : x
  2. Step 2: Convert to fraction form
    1,128.70/1,559.73 = 814.92/x
  3. Step 3: Cross multiply
    1,128.70x = 1,559.73 × 814.92
  4. Step 4: Simplify right side
    1,128.70x = 1,271,051.10
  5. Step 5: Solve for x
    x = 1,271,051.10/1,128.70
  6. Step 6: Final answer
    x = 1,126.12

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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.