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Finding the Fourth Proportional to 139,040.70, 208,561.05 and 104,048.70

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Solution

The fourth proportional to 139,040.70, 208,561.05 and 104,048.70 is: 156,073.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,040.70 : 208,561.05 = 104,048.70 : x
  2. Step 2: Convert to fraction form
    139,040.70/208,561.05 = 104,048.70/x
  3. Step 3: Cross multiply
    139,040.70x = 208,561.05 × 104,048.70
  4. Step 4: Simplify right side
    139,040.70x = 21,700,506,123.14
  5. Step 5: Solve for x
    x = 21,700,506,123.14/139,040.70
  6. Step 6: Final answer
    x = 156,073.05

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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.