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Finding the Fourth Proportional to 1,540.29, 2,124.86 and 980.13

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Solution

The fourth proportional to 1,540.29, 2,124.86 and 980.13 is: 1,352.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540.29 : 2,124.86 = 980.13 : x
  2. Step 2: Convert to fraction form
    1,540.29/2,124.86 = 980.13/x
  3. Step 3: Cross multiply
    1,540.29x = 2,124.86 × 980.13
  4. Step 4: Simplify right side
    1,540.29x = 2,082,634.13
  5. Step 5: Solve for x
    x = 2,082,634.13/1,540.29
  6. Step 6: Final answer
    x = 1,352.11

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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.