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Finding the Fourth Proportional to 912.98, 1,259.12 and 771.87

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Solution

The fourth proportional to 912.98, 1,259.12 and 771.87 is: 1,064.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.98 : 1,259.12 = 771.87 : x
  2. Step 2: Convert to fraction form
    912.98/1,259.12 = 771.87/x
  3. Step 3: Cross multiply
    912.98x = 1,259.12 × 771.87
  4. Step 4: Simplify right side
    912.98x = 971,876.95
  5. Step 5: Solve for x
    x = 971,876.95/912.98
  6. Step 6: Final answer
    x = 1,064.51

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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.