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Finding the Fourth Proportional to 1,257.68, 1,736.95 and 981.20

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Solution

The fourth proportional to 1,257.68, 1,736.95 and 981.20 is: 1,355.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.68 : 1,736.95 = 981.20 : x
  2. Step 2: Convert to fraction form
    1,257.68/1,736.95 = 981.20/x
  3. Step 3: Cross multiply
    1,257.68x = 1,736.95 × 981.20
  4. Step 4: Simplify right side
    1,257.68x = 1,704,284.20
  5. Step 5: Solve for x
    x = 1,704,284.20/1,257.68
  6. Step 6: Final answer
    x = 1,355.11

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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.