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Finding the Fourth Proportional to 79,780.66, 119,681.92 and 35,406.43

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Solution

The fourth proportional to 79,780.66, 119,681.92 and 35,406.43 is: 53,114.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,780.66 : 119,681.92 = 35,406.43 : x
  2. Step 2: Convert to fraction form
    79,780.66/119,681.92 = 35,406.43/x
  3. Step 3: Cross multiply
    79,780.66x = 119,681.92 × 35,406.43
  4. Step 4: Simplify right side
    79,780.66x = 4,237,509,522.75
  5. Step 5: Solve for x
    x = 4,237,509,522.75/79,780.66
  6. Step 6: Final answer
    x = 53,114.50

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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.