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Finding the Fourth Proportional to 210, 314.78 and 101.55

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Solution

The fourth proportional to 210, 314.78 and 101.55 is: 152.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    210 : 314.78 = 101.55 : x
  2. Step 2: Convert to fraction form
    210/314.78 = 101.55/x
  3. Step 3: Cross multiply
    210x = 314.78 × 101.55
  4. Step 4: Simplify right side
    210x = 31,965.40
  5. Step 5: Solve for x
    x = 31,965.40/210
  6. Step 6: Final answer
    x = 152.22

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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.