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Finding the Fourth Proportional to 708.78, 1,061.58 and 342.92

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Solution

The fourth proportional to 708.78, 1,061.58 and 342.92 is: 513.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.78 : 1,061.58 = 342.92 : x
  2. Step 2: Convert to fraction form
    708.78/1,061.58 = 342.92/x
  3. Step 3: Cross multiply
    708.78x = 1,061.58 × 342.92
  4. Step 4: Simplify right side
    708.78x = 364,031.71
  5. Step 5: Solve for x
    x = 364,031.71/708.78
  6. Step 6: Final answer
    x = 513.60

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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.