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Finding the Fourth Proportional to 1,549.55, 2,138.39 and 841.40

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Solution

The fourth proportional to 1,549.55, 2,138.39 and 841.40 is: 1,161.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,549.55 : 2,138.39 = 841.40 : x
  2. Step 2: Convert to fraction form
    1,549.55/2,138.39 = 841.40/x
  3. Step 3: Cross multiply
    1,549.55x = 2,138.39 × 841.40
  4. Step 4: Simplify right side
    1,549.55x = 1,799,229.24
  5. Step 5: Solve for x
    x = 1,799,229.24/1,549.55
  6. Step 6: Final answer
    x = 1,161.13

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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.