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Finding the Fourth Proportional to 340.31, 510.47 and 83.81

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Solution

The fourth proportional to 340.31, 510.47 and 83.81 is: 125.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.31 : 510.47 = 83.81 : x
  2. Step 2: Convert to fraction form
    340.31/510.47 = 83.81/x
  3. Step 3: Cross multiply
    340.31x = 510.47 × 83.81
  4. Step 4: Simplify right side
    340.31x = 42,783.66
  5. Step 5: Solve for x
    x = 42,783.66/340.31
  6. Step 6: Final answer
    x = 125.72

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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.