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Finding the Fourth Proportional to 215.15, 296.78 and 153.07

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Solution

The fourth proportional to 215.15, 296.78 and 153.07 is: 211.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.15 : 296.78 = 153.07 : x
  2. Step 2: Convert to fraction form
    215.15/296.78 = 153.07/x
  3. Step 3: Cross multiply
    215.15x = 296.78 × 153.07
  4. Step 4: Simplify right side
    215.15x = 45,428.13
  5. Step 5: Solve for x
    x = 45,428.13/215.15
  6. Step 6: Final answer
    x = 211.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.