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Finding the Fourth Proportional to 912.10, 1,258.70 and 539.10

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Solution

The fourth proportional to 912.10, 1,258.70 and 539.10 is: 743.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.10 : 1,258.70 = 539.10 : x
  2. Step 2: Convert to fraction form
    912.10/1,258.70 = 539.10/x
  3. Step 3: Cross multiply
    912.10x = 1,258.70 × 539.10
  4. Step 4: Simplify right side
    912.10x = 678,565.17
  5. Step 5: Solve for x
    x = 678,565.17/912.10
  6. Step 6: Final answer
    x = 743.96

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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.