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Finding the Fourth Proportional to 152.70, 210.78 and 123.54

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Solution

The fourth proportional to 152.70, 210.78 and 123.54 is: 170.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.70 : 210.78 = 123.54 : x
  2. Step 2: Convert to fraction form
    152.70/210.78 = 123.54/x
  3. Step 3: Cross multiply
    152.70x = 210.78 × 123.54
  4. Step 4: Simplify right side
    152.70x = 26,039.76
  5. Step 5: Solve for x
    x = 26,039.76/152.70
  6. Step 6: Final answer
    x = 170.53

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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.