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Finding the Fourth Proportional to 9,210.78, 12,711.12 and 5,019.30

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Solution

The fourth proportional to 9,210.78, 12,711.12 and 5,019.30 is: 6,926.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,210.78 : 12,711.12 = 5,019.30 : x
  2. Step 2: Convert to fraction form
    9,210.78/12,711.12 = 5,019.30/x
  3. Step 3: Cross multiply
    9,210.78x = 12,711.12 × 5,019.30
  4. Step 4: Simplify right side
    9,210.78x = 63,800,924.62
  5. Step 5: Solve for x
    x = 63,800,924.62/9,210.78
  6. Step 6: Final answer
    x = 6,926.77

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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.