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Finding the Fourth Proportional to 210,876.30, 316,281.96 and 68,721.23

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Solution

The fourth proportional to 210,876.30, 316,281.96 and 68,721.23 is: 103,071.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,876.30 : 316,281.96 = 68,721.23 : x
  2. Step 2: Convert to fraction form
    210,876.30/316,281.96 = 68,721.23/x
  3. Step 3: Cross multiply
    210,876.30x = 316,281.96 × 68,721.23
  4. Step 4: Simplify right side
    210,876.30x = 21,735,286,108.72
  5. Step 5: Solve for x
    x = 21,735,286,108.72/210,876.30
  6. Step 6: Final answer
    x = 103,071.26

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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.