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Finding the Fourth Proportional to 768.96, 1,062.72 and 572.40

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Solution

The fourth proportional to 768.96, 1,062.72 and 572.40 is: 791.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.96 : 1,062.72 = 572.40 : x
  2. Step 2: Convert to fraction form
    768.96/1,062.72 = 572.40/x
  3. Step 3: Cross multiply
    768.96x = 1,062.72 × 572.40
  4. Step 4: Simplify right side
    768.96x = 608,300.93
  5. Step 5: Solve for x
    x = 608,300.93/768.96
  6. Step 6: Final answer
    x = 791.07

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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.