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Finding the Fourth Proportional to 912.16, 1,258.81 and 528.96

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Solution

The fourth proportional to 912.16, 1,258.81 and 528.96 is: 729.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.16 : 1,258.81 = 528.96 : x
  2. Step 2: Convert to fraction form
    912.16/1,258.81 = 528.96/x
  3. Step 3: Cross multiply
    912.16x = 1,258.81 × 528.96
  4. Step 4: Simplify right side
    912.16x = 665,861.96
  5. Step 5: Solve for x
    x = 665,861.96/912.16
  6. Step 6: Final answer
    x = 729.98

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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.