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Finding the Fourth Proportional to 210,949.54, 316,475.07 and 86,290.90

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Solution

The fourth proportional to 210,949.54, 316,475.07 and 86,290.90 is: 129,457.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,949.54 : 316,475.07 = 86,290.90 : x
  2. Step 2: Convert to fraction form
    210,949.54/316,475.07 = 86,290.90/x
  3. Step 3: Cross multiply
    210,949.54x = 316,475.07 × 86,290.90
  4. Step 4: Simplify right side
    210,949.54x = 27,308,918,617.86
  5. Step 5: Solve for x
    x = 27,308,918,617.86/210,949.54
  6. Step 6: Final answer
    x = 129,457.11

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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.