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Finding the Fourth Proportional to 211,062.40, 316,324.80 and 86,262.40

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Solution

The fourth proportional to 211,062.40, 316,324.80 and 86,262.40 is: 129,283.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,062.40 : 316,324.80 = 86,262.40 : x
  2. Step 2: Convert to fraction form
    211,062.40/316,324.80 = 86,262.40/x
  3. Step 3: Cross multiply
    211,062.40x = 316,324.80 × 86,262.40
  4. Step 4: Simplify right side
    211,062.40x = 27,286,936,427.52
  5. Step 5: Solve for x
    x = 27,286,936,427.52/211,062.40
  6. Step 6: Final answer
    x = 129,283.74

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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.