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Finding the Fourth Proportional to 1,129.69, 1,694.54 and 479.98

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Solution

The fourth proportional to 1,129.69, 1,694.54 and 479.98 is: 719.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.69 : 1,694.54 = 479.98 : x
  2. Step 2: Convert to fraction form
    1,129.69/1,694.54 = 479.98/x
  3. Step 3: Cross multiply
    1,129.69x = 1,694.54 × 479.98
  4. Step 4: Simplify right side
    1,129.69x = 813,345.31
  5. Step 5: Solve for x
    x = 813,345.31/1,129.69
  6. Step 6: Final answer
    x = 719.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.