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Finding the Fourth Proportional to 815.49, 1,125.55 and 500.75

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Solution

The fourth proportional to 815.49, 1,125.55 and 500.75 is: 691.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.49 : 1,125.55 = 500.75 : x
  2. Step 2: Convert to fraction form
    815.49/1,125.55 = 500.75/x
  3. Step 3: Cross multiply
    815.49x = 1,125.55 × 500.75
  4. Step 4: Simplify right side
    815.49x = 563,619.16
  5. Step 5: Solve for x
    x = 563,619.16/815.49
  6. Step 6: Final answer
    x = 691.14

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1.5x scale

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.