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Finding the Fourth Proportional to 1,225.45, 1,691.41 and 701.78

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Solution

The fourth proportional to 1,225.45, 1,691.41 and 701.78 is: 968.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.45 : 1,691.41 = 701.78 : x
  2. Step 2: Convert to fraction form
    1,225.45/1,691.41 = 701.78/x
  3. Step 3: Cross multiply
    1,225.45x = 1,691.41 × 701.78
  4. Step 4: Simplify right side
    1,225.45x = 1,186,997.71
  5. Step 5: Solve for x
    x = 1,186,997.71/1,225.45
  6. Step 6: Final answer
    x = 968.63

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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.