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Finding the Fourth Proportional to 912.39, 1,258.92 and 539.34

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Solution

The fourth proportional to 912.39, 1,258.92 and 539.34 is: 744.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.39 : 1,258.92 = 539.34 : x
  2. Step 2: Convert to fraction form
    912.39/1,258.92 = 539.34/x
  3. Step 3: Cross multiply
    912.39x = 1,258.92 × 539.34
  4. Step 4: Simplify right side
    912.39x = 678,985.91
  5. Step 5: Solve for x
    x = 678,985.91/912.39
  6. Step 6: Final answer
    x = 744.18

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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.