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Finding the Fourth Proportional to 40,978.51, 61,428.89 and 14,669.71

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Solution

The fourth proportional to 40,978.51, 61,428.89 and 14,669.71 is: 21,990.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,978.51 : 61,428.89 = 14,669.71 : x
  2. Step 2: Convert to fraction form
    40,978.51/61,428.89 = 14,669.71/x
  3. Step 3: Cross multiply
    40,978.51x = 61,428.89 × 14,669.71
  4. Step 4: Simplify right side
    40,978.51x = 901,143,928.57
  5. Step 5: Solve for x
    x = 901,143,928.57/40,978.51
  6. Step 6: Final answer
    x = 21,990.65

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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.