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Finding the Fourth Proportional to 865.29, 1,292.57 and 778.48

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Solution

The fourth proportional to 865.29, 1,292.57 and 778.48 is: 1,162.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.29 : 1,292.57 = 778.48 : x
  2. Step 2: Convert to fraction form
    865.29/1,292.57 = 778.48/x
  3. Step 3: Cross multiply
    865.29x = 1,292.57 × 778.48
  4. Step 4: Simplify right side
    865.29x = 1,006,239.89
  5. Step 5: Solve for x
    x = 1,006,239.89/865.29
  6. Step 6: Final answer
    x = 1,162.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.