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Finding the Fourth Proportional to 1,223.79, 1,691.19 and 909.51

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Solution

The fourth proportional to 1,223.79, 1,691.19 and 909.51 is: 1,256.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.79 : 1,691.19 = 909.51 : x
  2. Step 2: Convert to fraction form
    1,223.79/1,691.19 = 909.51/x
  3. Step 3: Cross multiply
    1,223.79x = 1,691.19 × 909.51
  4. Step 4: Simplify right side
    1,223.79x = 1,538,154.22
  5. Step 5: Solve for x
    x = 1,538,154.22/1,223.79
  6. Step 6: Final answer
    x = 1,256.88

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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.