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Finding the Fourth Proportional to 90,819, 136,229.09 and 31,655.79

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Solution

The fourth proportional to 90,819, 136,229.09 and 31,655.79 is: 47,483.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,819 : 136,229.09 = 31,655.79 : x
  2. Step 2: Convert to fraction form
    90,819/136,229.09 = 31,655.79/x
  3. Step 3: Cross multiply
    90,819x = 136,229.09 × 31,655.79
  4. Step 4: Simplify right side
    90,819x = 4,312,439,306.65
  5. Step 5: Solve for x
    x = 4,312,439,306.65/90,819
  6. Step 6: Final answer
    x = 47,483.89

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1.5x scale

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.