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Finding the Fourth Proportional to 1,344.76, 1,854.78 and 990.79

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Solution

The fourth proportional to 1,344.76, 1,854.78 and 990.79 is: 1,366.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,344.76 : 1,854.78 = 990.79 : x
  2. Step 2: Convert to fraction form
    1,344.76/1,854.78 = 990.79/x
  3. Step 3: Cross multiply
    1,344.76x = 1,854.78 × 990.79
  4. Step 4: Simplify right side
    1,344.76x = 1,837,697.48
  5. Step 5: Solve for x
    x = 1,837,697.48/1,344.76
  6. Step 6: Final answer
    x = 1,366.56

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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.