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Finding the Fourth Proportional to 1,318.66, 1,977.99 and 906.55

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Solution

The fourth proportional to 1,318.66, 1,977.99 and 906.55 is: 1,359.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.66 : 1,977.99 = 906.55 : x
  2. Step 2: Convert to fraction form
    1,318.66/1,977.99 = 906.55/x
  3. Step 3: Cross multiply
    1,318.66x = 1,977.99 × 906.55
  4. Step 4: Simplify right side
    1,318.66x = 1,793,138.49
  5. Step 5: Solve for x
    x = 1,793,138.49/1,318.66
  6. Step 6: Final answer
    x = 1,359.82

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.