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Finding the Fourth Proportional to 261.02, 390.99 and 123.65

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Solution

The fourth proportional to 261.02, 390.99 and 123.65 is: 185.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.02 : 390.99 = 123.65 : x
  2. Step 2: Convert to fraction form
    261.02/390.99 = 123.65/x
  3. Step 3: Cross multiply
    261.02x = 390.99 × 123.65
  4. Step 4: Simplify right side
    261.02x = 48,345.89
  5. Step 5: Solve for x
    x = 48,345.89/261.02
  6. Step 6: Final answer
    x = 185.22

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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.