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Finding the Fourth Proportional to 287,806.60, 431,709.90 and 90,814.60

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Solution

The fourth proportional to 287,806.60, 431,709.90 and 90,814.60 is: 136,221.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,806.60 : 431,709.90 = 90,814.60 : x
  2. Step 2: Convert to fraction form
    287,806.60/431,709.90 = 90,814.60/x
  3. Step 3: Cross multiply
    287,806.60x = 431,709.90 × 90,814.60
  4. Step 4: Simplify right side
    287,806.60x = 39,205,561,884.54
  5. Step 5: Solve for x
    x = 39,205,561,884.54/287,806.60
  6. Step 6: Final answer
    x = 136,221.90

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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.