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Finding the Fourth Proportional to 210.90, 316.50 and 156.90

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Solution

The fourth proportional to 210.90, 316.50 and 156.90 is: 235.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.90 : 316.50 = 156.90 : x
  2. Step 2: Convert to fraction form
    210.90/316.50 = 156.90/x
  3. Step 3: Cross multiply
    210.90x = 316.50 × 156.90
  4. Step 4: Simplify right side
    210.90x = 49,658.85
  5. Step 5: Solve for x
    x = 49,658.85/210.90
  6. Step 6: Final answer
    x = 235.46

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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.