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Finding the Fourth Proportional to 210.39, 315.28 and 152.47

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Solution

The fourth proportional to 210.39, 315.28 and 152.47 is: 228.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.39 : 315.28 = 152.47 : x
  2. Step 2: Convert to fraction form
    210.39/315.28 = 152.47/x
  3. Step 3: Cross multiply
    210.39x = 315.28 × 152.47
  4. Step 4: Simplify right side
    210.39x = 48,069.98
  5. Step 5: Solve for x
    x = 48,069.98/210.39
  6. Step 6: Final answer
    x = 228.49

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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.