Home / 28,115.69-42,187.28-12,318.55

Finding the Fourth Proportional to 28,115.69, 42,187.28 and 12,318.55

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Solution

The fourth proportional to 28,115.69, 42,187.28 and 12,318.55 is: 18,483.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.69 : 42,187.28 = 12,318.55 : x
  2. Step 2: Convert to fraction form
    28,115.69/42,187.28 = 12,318.55/x
  3. Step 3: Cross multiply
    28,115.69x = 42,187.28 × 12,318.55
  4. Step 4: Simplify right side
    28,115.69x = 519,685,950.98
  5. Step 5: Solve for x
    x = 519,685,950.98/28,115.69
  6. Step 6: Final answer
    x = 18,483.84

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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.