Home / 28,115.57-42,185.03-12,312.45

Finding the Fourth Proportional to 28,115.57, 42,185.03 and 12,312.45

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Solution

The fourth proportional to 28,115.57, 42,185.03 and 12,312.45 is: 18,473.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.57 : 42,185.03 = 12,312.45 : x
  2. Step 2: Convert to fraction form
    28,115.57/42,185.03 = 12,312.45/x
  3. Step 3: Cross multiply
    28,115.57x = 42,185.03 × 12,312.45
  4. Step 4: Simplify right side
    28,115.57x = 519,401,011.06
  5. Step 5: Solve for x
    x = 519,401,011.06/28,115.57
  6. Step 6: Final answer
    x = 18,473.78

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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.