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Finding the Fourth Proportional to 101,503.68, 139,982.52 and 87,159

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Solution

The fourth proportional to 101,503.68, 139,982.52 and 87,159 is: 120,199.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,503.68 : 139,982.52 = 87,159 : x
  2. Step 2: Convert to fraction form
    101,503.68/139,982.52 = 87,159/x
  3. Step 3: Cross multiply
    101,503.68x = 139,982.52 × 87,159
  4. Step 4: Simplify right side
    101,503.68x = 12,200,736,460.68
  5. Step 5: Solve for x
    x = 12,200,736,460.68/101,503.68
  6. Step 6: Final answer
    x = 120,199.94

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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.