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Finding the Fourth Proportional to 138,699.25, 191,406.35 and 75,038.42

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Solution

The fourth proportional to 138,699.25, 191,406.35 and 75,038.42 is: 103,553.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,699.25 : 191,406.35 = 75,038.42 : x
  2. Step 2: Convert to fraction form
    138,699.25/191,406.35 = 75,038.42/x
  3. Step 3: Cross multiply
    138,699.25x = 191,406.35 × 75,038.42
  4. Step 4: Simplify right side
    138,699.25x = 14,362,829,124.94
  5. Step 5: Solve for x
    x = 14,362,829,124.94/138,699.25
  6. Step 6: Final answer
    x = 103,553.76

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1.5x scale

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.