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Finding the Fourth Proportional to 210.60, 315.29 and 156.74

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Solution

The fourth proportional to 210.60, 315.29 and 156.74 is: 234.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.60 : 315.29 = 156.74 : x
  2. Step 2: Convert to fraction form
    210.60/315.29 = 156.74/x
  3. Step 3: Cross multiply
    210.60x = 315.29 × 156.74
  4. Step 4: Simplify right side
    210.60x = 49,417.37
  5. Step 5: Solve for x
    x = 49,417.37/210.60
  6. Step 6: Final answer
    x = 234.65

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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.