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Finding the Fourth Proportional to 70,239.88, 105,359.92 and 28,686.88

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Solution

The fourth proportional to 70,239.88, 105,359.92 and 28,686.88 is: 43,030.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,239.88 : 105,359.92 = 28,686.88 : x
  2. Step 2: Convert to fraction form
    70,239.88/105,359.92 = 28,686.88/x
  3. Step 3: Cross multiply
    70,239.88x = 105,359.92 × 28,686.88
  4. Step 4: Simplify right side
    70,239.88x = 3,022,447,381.85
  5. Step 5: Solve for x
    x = 3,022,447,381.85/70,239.88
  6. Step 6: Final answer
    x = 43,030.36

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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.