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Finding the Fourth Proportional to 1,278.76, 1,763.58 and 885.40

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Solution

The fourth proportional to 1,278.76, 1,763.58 and 885.40 is: 1,221.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.76 : 1,763.58 = 885.40 : x
  2. Step 2: Convert to fraction form
    1,278.76/1,763.58 = 885.40/x
  3. Step 3: Cross multiply
    1,278.76x = 1,763.58 × 885.40
  4. Step 4: Simplify right side
    1,278.76x = 1,561,473.73
  5. Step 5: Solve for x
    x = 1,561,473.73/1,278.76
  6. Step 6: Final answer
    x = 1,221.08

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Half scale
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Double scale
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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.