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Finding the Fourth Proportional to 1,315.99, 1,816.19 and 726.64

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Solution

The fourth proportional to 1,315.99, 1,816.19 and 726.64 is: 1,002.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.99 : 1,816.19 = 726.64 : x
  2. Step 2: Convert to fraction form
    1,315.99/1,816.19 = 726.64/x
  3. Step 3: Cross multiply
    1,315.99x = 1,816.19 × 726.64
  4. Step 4: Simplify right side
    1,315.99x = 1,319,714.94
  5. Step 5: Solve for x
    x = 1,319,714.94/1,315.99
  6. Step 6: Final answer
    x = 1,002.83

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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.