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Finding the Fourth Proportional to 1,240.82, 1,714.68 and 980.90

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Solution

The fourth proportional to 1,240.82, 1,714.68 and 980.90 is: 1,355.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.82 : 1,714.68 = 980.90 : x
  2. Step 2: Convert to fraction form
    1,240.82/1,714.68 = 980.90/x
  3. Step 3: Cross multiply
    1,240.82x = 1,714.68 × 980.90
  4. Step 4: Simplify right side
    1,240.82x = 1,681,929.61
  5. Step 5: Solve for x
    x = 1,681,929.61/1,240.82
  6. Step 6: Final answer
    x = 1,355.50

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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.