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Finding the Fourth Proportional to 912.25, 1,258.70 and 539.25

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Solution

The fourth proportional to 912.25, 1,258.70 and 539.25 is: 744.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.25 : 1,258.70 = 539.25 : x
  2. Step 2: Convert to fraction form
    912.25/1,258.70 = 539.25/x
  3. Step 3: Cross multiply
    912.25x = 1,258.70 × 539.25
  4. Step 4: Simplify right side
    912.25x = 678,753.98
  5. Step 5: Solve for x
    x = 678,753.98/912.25
  6. Step 6: Final answer
    x = 744.04

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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.