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Finding the Fourth Proportional to 929.49, 1,282.72 and 556.86

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Solution

The fourth proportional to 929.49, 1,282.72 and 556.86 is: 768.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.49 : 1,282.72 = 556.86 : x
  2. Step 2: Convert to fraction form
    929.49/1,282.72 = 556.86/x
  3. Step 3: Cross multiply
    929.49x = 1,282.72 × 556.86
  4. Step 4: Simplify right side
    929.49x = 714,295.46
  5. Step 5: Solve for x
    x = 714,295.46/929.49
  6. Step 6: Final answer
    x = 768.48

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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.