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Finding the Fourth Proportional to 1,229.74, 1,697.80 and 914.64

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Solution

The fourth proportional to 1,229.74, 1,697.80 and 914.64 is: 1,262.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.74 : 1,697.80 = 914.64 : x
  2. Step 2: Convert to fraction form
    1,229.74/1,697.80 = 914.64/x
  3. Step 3: Cross multiply
    1,229.74x = 1,697.80 × 914.64
  4. Step 4: Simplify right side
    1,229.74x = 1,552,875.79
  5. Step 5: Solve for x
    x = 1,552,875.79/1,229.74
  6. Step 6: Final answer
    x = 1,262.77

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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.