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Finding the Fourth Proportional to 210.48, 315.06 and 155.70

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Solution

The fourth proportional to 210.48, 315.06 and 155.70 is: 233.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.48 : 315.06 = 155.70 : x
  2. Step 2: Convert to fraction form
    210.48/315.06 = 155.70/x
  3. Step 3: Cross multiply
    210.48x = 315.06 × 155.70
  4. Step 4: Simplify right side
    210.48x = 49,054.84
  5. Step 5: Solve for x
    x = 49,054.84/210.48
  6. Step 6: Final answer
    x = 233.06

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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.