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Finding the Fourth Proportional to 28,658.67, 42,989.39 and 12,019.25

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Solution

The fourth proportional to 28,658.67, 42,989.39 and 12,019.25 is: 18,029.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,658.67 : 42,989.39 = 12,019.25 : x
  2. Step 2: Convert to fraction form
    28,658.67/42,989.39 = 12,019.25/x
  3. Step 3: Cross multiply
    28,658.67x = 42,989.39 × 12,019.25
  4. Step 4: Simplify right side
    28,658.67x = 516,699,950.71
  5. Step 5: Solve for x
    x = 516,699,950.71/28,658.67
  6. Step 6: Final answer
    x = 18,029.45

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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.