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Finding the Fourth Proportional to 926.91, 1,279.80 and 665.01

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Solution

The fourth proportional to 926.91, 1,279.80 and 665.01 is: 918.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.91 : 1,279.80 = 665.01 : x
  2. Step 2: Convert to fraction form
    926.91/1,279.80 = 665.01/x
  3. Step 3: Cross multiply
    926.91x = 1,279.80 × 665.01
  4. Step 4: Simplify right side
    926.91x = 851,079.80
  5. Step 5: Solve for x
    x = 851,079.80/926.91
  6. Step 6: Final answer
    x = 918.19

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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.