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Finding the Fourth Proportional to 139,221.40, 208,840.53 and 39,389.17

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Solution

The fourth proportional to 139,221.40, 208,840.53 and 39,389.17 is: 59,086.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,221.40 : 208,840.53 = 39,389.17 : x
  2. Step 2: Convert to fraction form
    139,221.40/208,840.53 = 39,389.17/x
  3. Step 3: Cross multiply
    139,221.40x = 208,840.53 × 39,389.17
  4. Step 4: Simplify right side
    139,221.40x = 8,226,055,139.06
  5. Step 5: Solve for x
    x = 8,226,055,139.06/139,221.40
  6. Step 6: Final answer
    x = 59,086.14

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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.