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Finding the Fourth Proportional to 912.28, 1,258.76 and 519.20

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Solution

The fourth proportional to 912.28, 1,258.76 and 519.20 is: 716.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.28 : 1,258.76 = 519.20 : x
  2. Step 2: Convert to fraction form
    912.28/1,258.76 = 519.20/x
  3. Step 3: Cross multiply
    912.28x = 1,258.76 × 519.20
  4. Step 4: Simplify right side
    912.28x = 653,548.19
  5. Step 5: Solve for x
    x = 653,548.19/912.28
  6. Step 6: Final answer
    x = 716.39

Related Problems

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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.