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Finding the Fourth Proportional to 210.61, 315.78 and 88.75

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Solution

The fourth proportional to 210.61, 315.78 and 88.75 is: 133.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.61 : 315.78 = 88.75 : x
  2. Step 2: Convert to fraction form
    210.61/315.78 = 88.75/x
  3. Step 3: Cross multiply
    210.61x = 315.78 × 88.75
  4. Step 4: Simplify right side
    210.61x = 28,025.48
  5. Step 5: Solve for x
    x = 28,025.48/210.61
  6. Step 6: Final answer
    x = 133.07

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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.