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Finding the Fourth Proportional to 912.32, 1,258.64 and 663.10

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Solution

The fourth proportional to 912.32, 1,258.64 and 663.10 is: 914.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.32 : 1,258.64 = 663.10 : x
  2. Step 2: Convert to fraction form
    912.32/1,258.64 = 663.10/x
  3. Step 3: Cross multiply
    912.32x = 1,258.64 × 663.10
  4. Step 4: Simplify right side
    912.32x = 834,604.18
  5. Step 5: Solve for x
    x = 834,604.18/912.32
  6. Step 6: Final answer
    x = 914.82

Related Problems

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.