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Finding the Fourth Proportional to 131,641.69, 181,638.69 and 77,899.81

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Solution

The fourth proportional to 131,641.69, 181,638.69 and 77,899.81 is: 107,485.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,641.69 : 181,638.69 = 77,899.81 : x
  2. Step 2: Convert to fraction form
    131,641.69/181,638.69 = 77,899.81/x
  3. Step 3: Cross multiply
    131,641.69x = 181,638.69 × 77,899.81
  4. Step 4: Simplify right side
    131,641.69x = 14,149,619,439.65
  5. Step 5: Solve for x
    x = 14,149,619,439.65/131,641.69
  6. Step 6: Final answer
    x = 107,485.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.