Home / 1,312.38-1,966.32-1,115.64

Finding the Fourth Proportional to 1,312.38, 1,966.32 and 1,115.64

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Solution

The fourth proportional to 1,312.38, 1,966.32 and 1,115.64 is: 1,671.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.38 : 1,966.32 = 1,115.64 : x
  2. Step 2: Convert to fraction form
    1,312.38/1,966.32 = 1,115.64/x
  3. Step 3: Cross multiply
    1,312.38x = 1,966.32 × 1,115.64
  4. Step 4: Simplify right side
    1,312.38x = 2,193,705.24
  5. Step 5: Solve for x
    x = 2,193,705.24/1,312.38
  6. Step 6: Final answer
    x = 1,671.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.