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Finding the Fourth Proportional to 103,690.95, 143,019.75 and 69,218.31

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Solution

The fourth proportional to 103,690.95, 143,019.75 and 69,218.31 is: 95,472.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,690.95 : 143,019.75 = 69,218.31 : x
  2. Step 2: Convert to fraction form
    103,690.95/143,019.75 = 69,218.31/x
  3. Step 3: Cross multiply
    103,690.95x = 143,019.75 × 69,218.31
  4. Step 4: Simplify right side
    103,690.95x = 9,899,586,187.52
  5. Step 5: Solve for x
    x = 9,899,586,187.52/103,690.95
  6. Step 6: Final answer
    x = 95,472.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.