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Finding the Fourth Proportional to 904.28, 1,247.82 and 718.22

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Solution

The fourth proportional to 904.28, 1,247.82 and 718.22 is: 991.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.28 : 1,247.82 = 718.22 : x
  2. Step 2: Convert to fraction form
    904.28/1,247.82 = 718.22/x
  3. Step 3: Cross multiply
    904.28x = 1,247.82 × 718.22
  4. Step 4: Simplify right side
    904.28x = 896,209.28
  5. Step 5: Solve for x
    x = 896,209.28/904.28
  6. Step 6: Final answer
    x = 991.07

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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.