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Finding the Fourth Proportional to 340.20, 510.34 and 123.78

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Solution

The fourth proportional to 340.20, 510.34 and 123.78 is: 185.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.20 : 510.34 = 123.78 : x
  2. Step 2: Convert to fraction form
    340.20/510.34 = 123.78/x
  3. Step 3: Cross multiply
    340.20x = 510.34 × 123.78
  4. Step 4: Simplify right side
    340.20x = 63,169.89
  5. Step 5: Solve for x
    x = 63,169.89/340.20
  6. Step 6: Final answer
    x = 185.68

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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.