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Finding the Fourth Proportional to 929.86, 1,282.86 and 556.72

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Solution

The fourth proportional to 929.86, 1,282.86 and 556.72 is: 768.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.86 : 1,282.86 = 556.72 : x
  2. Step 2: Convert to fraction form
    929.86/1,282.86 = 556.72/x
  3. Step 3: Cross multiply
    929.86x = 1,282.86 × 556.72
  4. Step 4: Simplify right side
    929.86x = 714,193.82
  5. Step 5: Solve for x
    x = 714,193.82/929.86
  6. Step 6: Final answer
    x = 768.07

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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.