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Finding the Fourth Proportional to 261.17, 390.93 and 168.50

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Solution

The fourth proportional to 261.17, 390.93 and 168.50 is: 252.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.17 : 390.93 = 168.50 : x
  2. Step 2: Convert to fraction form
    261.17/390.93 = 168.50/x
  3. Step 3: Cross multiply
    261.17x = 390.93 × 168.50
  4. Step 4: Simplify right side
    261.17x = 65,871.71
  5. Step 5: Solve for x
    x = 65,871.71/261.17
  6. Step 6: Final answer
    x = 252.22

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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.