Home / 8,715.72-12,030.78-5,178.91

Finding the Fourth Proportional to 8,715.72, 12,030.78 and 5,178.91

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Solution

The fourth proportional to 8,715.72, 12,030.78 and 5,178.91 is: 7,148.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,715.72 : 12,030.78 = 5,178.91 : x
  2. Step 2: Convert to fraction form
    8,715.72/12,030.78 = 5,178.91/x
  3. Step 3: Cross multiply
    8,715.72x = 12,030.78 × 5,178.91
  4. Step 4: Simplify right side
    8,715.72x = 62,306,326.85
  5. Step 5: Solve for x
    x = 62,306,326.85/8,715.72
  6. Step 6: Final answer
    x = 7,148.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.