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Finding the Fourth Proportional to 261.50, 389.34 and 260.69

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Solution

The fourth proportional to 261.50, 389.34 and 260.69 is: 388.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.50 : 389.34 = 260.69 : x
  2. Step 2: Convert to fraction form
    261.50/389.34 = 260.69/x
  3. Step 3: Cross multiply
    261.50x = 389.34 × 260.69
  4. Step 4: Simplify right side
    261.50x = 101,495.10
  5. Step 5: Solve for x
    x = 101,495.10/261.50
  6. Step 6: Final answer
    x = 388.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.