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Finding the Fourth Proportional to 914.97, 1,263.39 and 718.14

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Solution

The fourth proportional to 914.97, 1,263.39 and 718.14 is: 991.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.97 : 1,263.39 = 718.14 : x
  2. Step 2: Convert to fraction form
    914.97/1,263.39 = 718.14/x
  3. Step 3: Cross multiply
    914.97x = 1,263.39 × 718.14
  4. Step 4: Simplify right side
    914.97x = 907,290.89
  5. Step 5: Solve for x
    x = 907,290.89/914.97
  6. Step 6: Final answer
    x = 991.61

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1.5x scale

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.