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Finding the Fourth Proportional to 210,708.18, 316,062.60 and 86,049.18

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Solution

The fourth proportional to 210,708.18, 316,062.60 and 86,049.18 is: 129,073.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,708.18 : 316,062.60 = 86,049.18 : x
  2. Step 2: Convert to fraction form
    210,708.18/316,062.60 = 86,049.18/x
  3. Step 3: Cross multiply
    210,708.18x = 316,062.60 × 86,049.18
  4. Step 4: Simplify right side
    210,708.18x = 27,196,927,558.67
  5. Step 5: Solve for x
    x = 27,196,927,558.67/210,708.18
  6. Step 6: Final answer
    x = 129,073.90

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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.