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Finding the Fourth Proportional to 715.78, 1,073.87 and 277.16

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Solution

The fourth proportional to 715.78, 1,073.87 and 277.16 is: 415.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.78 : 1,073.87 = 277.16 : x
  2. Step 2: Convert to fraction form
    715.78/1,073.87 = 277.16/x
  3. Step 3: Cross multiply
    715.78x = 1,073.87 × 277.16
  4. Step 4: Simplify right side
    715.78x = 297,632.42
  5. Step 5: Solve for x
    x = 297,632.42/715.78
  6. Step 6: Final answer
    x = 415.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.