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Finding the Fourth Proportional to 70,278.17, 105,431.36 and 25,905.15

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Solution

The fourth proportional to 70,278.17, 105,431.36 and 25,905.15 is: 38,862.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,278.17 : 105,431.36 = 25,905.15 : x
  2. Step 2: Convert to fraction form
    70,278.17/105,431.36 = 25,905.15/x
  3. Step 3: Cross multiply
    70,278.17x = 105,431.36 × 25,905.15
  4. Step 4: Simplify right side
    70,278.17x = 2,731,215,065.98
  5. Step 5: Solve for x
    x = 2,731,215,065.98/70,278.17
  6. Step 6: Final answer
    x = 38,862.93

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1.5x scale

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.