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Finding the Fourth Proportional to 90,689.70, 136,059.03 and 31,528.65

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Solution

The fourth proportional to 90,689.70, 136,059.03 and 31,528.65 is: 47,301.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,689.70 : 136,059.03 = 31,528.65 : x
  2. Step 2: Convert to fraction form
    90,689.70/136,059.03 = 31,528.65/x
  3. Step 3: Cross multiply
    90,689.70x = 136,059.03 × 31,528.65
  4. Step 4: Simplify right side
    90,689.70x = 4,289,757,536.21
  5. Step 5: Solve for x
    x = 4,289,757,536.21/90,689.70
  6. Step 6: Final answer
    x = 47,301.49

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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.