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Finding the Fourth Proportional to 139,712.51, 209,570.74 and 39,872.72

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Solution

The fourth proportional to 139,712.51, 209,570.74 and 39,872.72 is: 59,809.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,712.51 : 209,570.74 = 39,872.72 : x
  2. Step 2: Convert to fraction form
    139,712.51/209,570.74 = 39,872.72/x
  3. Step 3: Cross multiply
    139,712.51x = 209,570.74 × 39,872.72
  4. Step 4: Simplify right side
    139,712.51x = 8,356,155,860.46
  5. Step 5: Solve for x
    x = 8,356,155,860.46/139,712.51
  6. Step 6: Final answer
    x = 59,809.65

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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.