Home / 1,248.21-1,880.73-1,115.55

Finding the Fourth Proportional to 1,248.21, 1,880.73 and 1,115.55

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Solution

The fourth proportional to 1,248.21, 1,880.73 and 1,115.55 is: 1,680.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.21 : 1,880.73 = 1,115.55 : x
  2. Step 2: Convert to fraction form
    1,248.21/1,880.73 = 1,115.55/x
  3. Step 3: Cross multiply
    1,248.21x = 1,880.73 × 1,115.55
  4. Step 4: Simplify right side
    1,248.21x = 2,098,048.35
  5. Step 5: Solve for x
    x = 2,098,048.35/1,248.21
  6. Step 6: Final answer
    x = 1,680.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.