Home / 1,238.32-1,857.12-621.60

Finding the Fourth Proportional to 1,238.32, 1,857.12 and 621.60

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Solution

The fourth proportional to 1,238.32, 1,857.12 and 621.60 is: 932.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.32 : 1,857.12 = 621.60 : x
  2. Step 2: Convert to fraction form
    1,238.32/1,857.12 = 621.60/x
  3. Step 3: Cross multiply
    1,238.32x = 1,857.12 × 621.60
  4. Step 4: Simplify right side
    1,238.32x = 1,154,385.79
  5. Step 5: Solve for x
    x = 1,154,385.79/1,238.32
  6. Step 6: Final answer
    x = 932.22

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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.