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Finding the Fourth Proportional to 152.80, 210.86 and 100.43

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Solution

The fourth proportional to 152.80, 210.86 and 100.43 is: 138.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.80 : 210.86 = 100.43 : x
  2. Step 2: Convert to fraction form
    152.80/210.86 = 100.43/x
  3. Step 3: Cross multiply
    152.80x = 210.86 × 100.43
  4. Step 4: Simplify right side
    152.80x = 21,176.28
  5. Step 5: Solve for x
    x = 21,176.28/152.80
  6. Step 6: Final answer
    x = 138.59

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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.