Home / 1,240.04-1,711.18-680.40

Finding the Fourth Proportional to 1,240.04, 1,711.18 and 680.40

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Solution

The fourth proportional to 1,240.04, 1,711.18 and 680.40 is: 938.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.04 : 1,711.18 = 680.40 : x
  2. Step 2: Convert to fraction form
    1,240.04/1,711.18 = 680.40/x
  3. Step 3: Cross multiply
    1,240.04x = 1,711.18 × 680.40
  4. Step 4: Simplify right side
    1,240.04x = 1,164,286.87
  5. Step 5: Solve for x
    x = 1,164,286.87/1,240.04
  6. Step 6: Final answer
    x = 938.91

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1.5x scale

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.