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Finding the Fourth Proportional to 1,286.76, 1,776.58 and 987.46

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Solution

The fourth proportional to 1,286.76, 1,776.58 and 987.46 is: 1,363.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.76 : 1,776.58 = 987.46 : x
  2. Step 2: Convert to fraction form
    1,286.76/1,776.58 = 987.46/x
  3. Step 3: Cross multiply
    1,286.76x = 1,776.58 × 987.46
  4. Step 4: Simplify right side
    1,286.76x = 1,754,301.69
  5. Step 5: Solve for x
    x = 1,754,301.69/1,286.76
  6. Step 6: Final answer
    x = 1,363.35

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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.