Home / 1,531.80-2,123.10-1,386

Finding the Fourth Proportional to 1,531.80, 2,123.10 and 1,386

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Solution

The fourth proportional to 1,531.80, 2,123.10 and 1,386 is: 1,921.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.80 : 2,123.10 = 1,386 : x
  2. Step 2: Convert to fraction form
    1,531.80/2,123.10 = 1,386/x
  3. Step 3: Cross multiply
    1,531.80x = 2,123.10 × 1,386
  4. Step 4: Simplify right side
    1,531.80x = 2,942,616.60
  5. Step 5: Solve for x
    x = 2,942,616.60/1,531.80
  6. Step 6: Final answer
    x = 1,921.02

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.