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Finding the Fourth Proportional to 1,487.32, 2,052.44 and 815.13

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Solution

The fourth proportional to 1,487.32, 2,052.44 and 815.13 is: 1,124.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.32 : 2,052.44 = 815.13 : x
  2. Step 2: Convert to fraction form
    1,487.32/2,052.44 = 815.13/x
  3. Step 3: Cross multiply
    1,487.32x = 2,052.44 × 815.13
  4. Step 4: Simplify right side
    1,487.32x = 1,672,993.12
  5. Step 5: Solve for x
    x = 1,672,993.12/1,487.32
  6. Step 6: Final answer
    x = 1,124.84

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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.