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Finding the Fourth Proportional to 70,391.88, 105,587.82 and 65,726.28

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Solution

The fourth proportional to 70,391.88, 105,587.82 and 65,726.28 is: 98,589.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,391.88 : 105,587.82 = 65,726.28 : x
  2. Step 2: Convert to fraction form
    70,391.88/105,587.82 = 65,726.28/x
  3. Step 3: Cross multiply
    70,391.88x = 105,587.82 × 65,726.28
  4. Step 4: Simplify right side
    70,391.88x = 6,939,894,621.91
  5. Step 5: Solve for x
    x = 6,939,894,621.91/70,391.88
  6. Step 6: Final answer
    x = 98,589.42

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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.