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Finding the Fourth Proportional to 211,015.65, 316,549.50 and 68,822.90

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Solution

The fourth proportional to 211,015.65, 316,549.50 and 68,822.90 is: 103,242.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,015.65 : 316,549.50 = 68,822.90 : x
  2. Step 2: Convert to fraction form
    211,015.65/316,549.50 = 68,822.90/x
  3. Step 3: Cross multiply
    211,015.65x = 316,549.50 × 68,822.90
  4. Step 4: Simplify right side
    211,015.65x = 21,785,854,583.55
  5. Step 5: Solve for x
    x = 21,785,854,583.55/211,015.65
  6. Step 6: Final answer
    x = 103,242.84

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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.