Home / 1,931.20-2,666.40-1,223.20

Finding the Fourth Proportional to 1,931.20, 2,666.40 and 1,223.20

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Solution

The fourth proportional to 1,931.20, 2,666.40 and 1,223.20 is: 1,688.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,931.20 : 2,666.40 = 1,223.20 : x
  2. Step 2: Convert to fraction form
    1,931.20/2,666.40 = 1,223.20/x
  3. Step 3: Cross multiply
    1,931.20x = 2,666.40 × 1,223.20
  4. Step 4: Simplify right side
    1,931.20x = 3,261,540.48
  5. Step 5: Solve for x
    x = 3,261,540.48/1,931.20
  6. Step 6: Final answer
    x = 1,688.87

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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.