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Finding the Fourth Proportional to 926.72, 1,278.89 and 512.72

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Solution

The fourth proportional to 926.72, 1,278.89 and 512.72 is: 707.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.72 : 1,278.89 = 512.72 : x
  2. Step 2: Convert to fraction form
    926.72/1,278.89 = 512.72/x
  3. Step 3: Cross multiply
    926.72x = 1,278.89 × 512.72
  4. Step 4: Simplify right side
    926.72x = 655,712.48
  5. Step 5: Solve for x
    x = 655,712.48/926.72
  6. Step 6: Final answer
    x = 707.56

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1.5x scale

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.