Home / 90,746.65-135,860.78-81,415.45

Finding the Fourth Proportional to 90,746.65, 135,860.78 and 81,415.45

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Solution

The fourth proportional to 90,746.65, 135,860.78 and 81,415.45 is: 121,890.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,746.65 : 135,860.78 = 81,415.45 : x
  2. Step 2: Convert to fraction form
    90,746.65/135,860.78 = 81,415.45/x
  3. Step 3: Cross multiply
    90,746.65x = 135,860.78 × 81,415.45
  4. Step 4: Simplify right side
    90,746.65x = 11,061,166,133.97
  5. Step 5: Solve for x
    x = 11,061,166,133.97/90,746.65
  6. Step 6: Final answer
    x = 121,890.63

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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.