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Finding the Fourth Proportional to 101,421.70, 139,967.26 and 58,407.72

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Solution

The fourth proportional to 101,421.70, 139,967.26 and 58,407.72 is: 80,605.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,421.70 : 139,967.26 = 58,407.72 : x
  2. Step 2: Convert to fraction form
    101,421.70/139,967.26 = 58,407.72/x
  3. Step 3: Cross multiply
    101,421.70x = 139,967.26 × 58,407.72
  4. Step 4: Simplify right side
    101,421.70x = 8,175,168,531.25
  5. Step 5: Solve for x
    x = 8,175,168,531.25/101,421.70
  6. Step 6: Final answer
    x = 80,605.71

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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.