Home / 1,391.52-1,915.92-1,130.40

Finding the Fourth Proportional to 1,391.52, 1,915.92 and 1,130.40

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Solution

The fourth proportional to 1,391.52, 1,915.92 and 1,130.40 is: 1,556.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.52 : 1,915.92 = 1,130.40 : x
  2. Step 2: Convert to fraction form
    1,391.52/1,915.92 = 1,130.40/x
  3. Step 3: Cross multiply
    1,391.52x = 1,915.92 × 1,130.40
  4. Step 4: Simplify right side
    1,391.52x = 2,165,755.97
  5. Step 5: Solve for x
    x = 2,165,755.97/1,391.52
  6. Step 6: Final answer
    x = 1,556.40

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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.