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Finding the Fourth Proportional to 913.98, 1,260.45 and 808.68

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Solution

The fourth proportional to 913.98, 1,260.45 and 808.68 is: 1,115.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.98 : 1,260.45 = 808.68 : x
  2. Step 2: Convert to fraction form
    913.98/1,260.45 = 808.68/x
  3. Step 3: Cross multiply
    913.98x = 1,260.45 × 808.68
  4. Step 4: Simplify right side
    913.98x = 1,019,300.71
  5. Step 5: Solve for x
    x = 1,019,300.71/913.98
  6. Step 6: Final answer
    x = 1,115.23

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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.