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Finding the Fourth Proportional to 815.64, 1,125 and 500.64

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Solution

The fourth proportional to 815.64, 1,125 and 500.64 is: 690.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.64 : 1,125 = 500.64 : x
  2. Step 2: Convert to fraction form
    815.64/1,125 = 500.64/x
  3. Step 3: Cross multiply
    815.64x = 1,125 × 500.64
  4. Step 4: Simplify right side
    815.64x = 563,220
  5. Step 5: Solve for x
    x = 563,220/815.64
  6. Step 6: Final answer
    x = 690.53

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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.