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Finding the Fourth Proportional to 261.23, 389.95 and 242.22

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Solution

The fourth proportional to 261.23, 389.95 and 242.22 is: 361.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.23 : 389.95 = 242.22 : x
  2. Step 2: Convert to fraction form
    261.23/389.95 = 242.22/x
  3. Step 3: Cross multiply
    261.23x = 389.95 × 242.22
  4. Step 4: Simplify right side
    261.23x = 94,454.55
  5. Step 5: Solve for x
    x = 94,454.55/261.23
  6. Step 6: Final answer
    x = 361.58

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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.