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Finding the Fourth Proportional to 1,475.76, 2,036.55 and 812.61

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Solution

The fourth proportional to 1,475.76, 2,036.55 and 812.61 is: 1,121.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,475.76 : 2,036.55 = 812.61 : x
  2. Step 2: Convert to fraction form
    1,475.76/2,036.55 = 812.61/x
  3. Step 3: Cross multiply
    1,475.76x = 2,036.55 × 812.61
  4. Step 4: Simplify right side
    1,475.76x = 1,654,920.90
  5. Step 5: Solve for x
    x = 1,654,920.90/1,475.76
  6. Step 6: Final answer
    x = 1,121.40

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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.