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Finding the Fourth Proportional to 153.45, 230.16 and 39.45

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Solution

The fourth proportional to 153.45, 230.16 and 39.45 is: 59.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.45 : 230.16 = 39.45 : x
  2. Step 2: Convert to fraction form
    153.45/230.16 = 39.45/x
  3. Step 3: Cross multiply
    153.45x = 230.16 × 39.45
  4. Step 4: Simplify right side
    153.45x = 9,079.81
  5. Step 5: Solve for x
    x = 9,079.81/153.45
  6. Step 6: Final answer
    x = 59.17

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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.