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Finding the Fourth Proportional to 1,225.62, 1,691.75 and 784.71

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Solution

The fourth proportional to 1,225.62, 1,691.75 and 784.71 is: 1,083.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.62 : 1,691.75 = 784.71 : x
  2. Step 2: Convert to fraction form
    1,225.62/1,691.75 = 784.71/x
  3. Step 3: Cross multiply
    1,225.62x = 1,691.75 × 784.71
  4. Step 4: Simplify right side
    1,225.62x = 1,327,533.14
  5. Step 5: Solve for x
    x = 1,327,533.14/1,225.62
  6. Step 6: Final answer
    x = 1,083.15

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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.