Home / 1,531.65-2,113.61-868.57

Finding the Fourth Proportional to 1,531.65, 2,113.61 and 868.57

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Solution

The fourth proportional to 1,531.65, 2,113.61 and 868.57 is: 1,198.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.65 : 2,113.61 = 868.57 : x
  2. Step 2: Convert to fraction form
    1,531.65/2,113.61 = 868.57/x
  3. Step 3: Cross multiply
    1,531.65x = 2,113.61 × 868.57
  4. Step 4: Simplify right side
    1,531.65x = 1,835,808.61
  5. Step 5: Solve for x
    x = 1,835,808.61/1,531.65
  6. Step 6: Final answer
    x = 1,198.58

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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.