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Finding the Fourth Proportional to 912.98, 1,259.07 and 807.68

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Solution

The fourth proportional to 912.98, 1,259.07 and 807.68 is: 1,113.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.98 : 1,259.07 = 807.68 : x
  2. Step 2: Convert to fraction form
    912.98/1,259.07 = 807.68/x
  3. Step 3: Cross multiply
    912.98x = 1,259.07 × 807.68
  4. Step 4: Simplify right side
    912.98x = 1,016,925.66
  5. Step 5: Solve for x
    x = 1,016,925.66/912.98
  6. Step 6: Final answer
    x = 1,113.85

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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.