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Finding the Fourth Proportional to 28,329, 42,658.80 and 20,985.54

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Solution

The fourth proportional to 28,329, 42,658.80 and 20,985.54 is: 31,600.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,329 : 42,658.80 = 20,985.54 : x
  2. Step 2: Convert to fraction form
    28,329/42,658.80 = 20,985.54/x
  3. Step 3: Cross multiply
    28,329x = 42,658.80 × 20,985.54
  4. Step 4: Simplify right side
    28,329x = 895,217,953.75
  5. Step 5: Solve for x
    x = 895,217,953.75/28,329
  6. Step 6: Final answer
    x = 31,600.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.