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Finding the Fourth Proportional to 912.47, 1,258.91 and 539.57

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Solution

The fourth proportional to 912.47, 1,258.91 and 539.57 is: 744.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.47 : 1,258.91 = 539.57 : x
  2. Step 2: Convert to fraction form
    912.47/1,258.91 = 539.57/x
  3. Step 3: Cross multiply
    912.47x = 1,258.91 × 539.57
  4. Step 4: Simplify right side
    912.47x = 679,261.08
  5. Step 5: Solve for x
    x = 679,261.08/912.47
  6. Step 6: Final answer
    x = 744.42

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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.