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Finding the Fourth Proportional to 139,013.96, 191,839.19 and 75,351.74

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Solution

The fourth proportional to 139,013.96, 191,839.19 and 75,351.74 is: 103,985.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,013.96 : 191,839.19 = 75,351.74 : x
  2. Step 2: Convert to fraction form
    139,013.96/191,839.19 = 75,351.74/x
  3. Step 3: Cross multiply
    139,013.96x = 191,839.19 × 75,351.74
  4. Step 4: Simplify right side
    139,013.96x = 14,455,415,430.74
  5. Step 5: Solve for x
    x = 14,455,415,430.74/139,013.96
  6. Step 6: Final answer
    x = 103,985.35

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1.5x scale

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.