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Finding the Fourth Proportional to 929.36, 1,279.08 and 666.80

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Solution

The fourth proportional to 929.36, 1,279.08 and 666.80 is: 917.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.36 : 1,279.08 = 666.80 : x
  2. Step 2: Convert to fraction form
    929.36/1,279.08 = 666.80/x
  3. Step 3: Cross multiply
    929.36x = 1,279.08 × 666.80
  4. Step 4: Simplify right side
    929.36x = 852,890.54
  5. Step 5: Solve for x
    x = 852,890.54/929.36
  6. Step 6: Final answer
    x = 917.72

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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.