Home / 1,387.28-2,088.75-1,223.79

Finding the Fourth Proportional to 1,387.28, 2,088.75 and 1,223.79

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Solution

The fourth proportional to 1,387.28, 2,088.75 and 1,223.79 is: 1,842.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.28 : 2,088.75 = 1,223.79 : x
  2. Step 2: Convert to fraction form
    1,387.28/2,088.75 = 1,223.79/x
  3. Step 3: Cross multiply
    1,387.28x = 2,088.75 × 1,223.79
  4. Step 4: Simplify right side
    1,387.28x = 2,556,191.36
  5. Step 5: Solve for x
    x = 2,556,191.36/1,387.28
  6. Step 6: Final answer
    x = 1,842.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.