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Finding the Fourth Proportional to 12,578.90, 18,870.62 and 5,179.32

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Solution

The fourth proportional to 12,578.90, 18,870.62 and 5,179.32 is: 7,769.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,578.90 : 18,870.62 = 5,179.32 : x
  2. Step 2: Convert to fraction form
    12,578.90/18,870.62 = 5,179.32/x
  3. Step 3: Cross multiply
    12,578.90x = 18,870.62 × 5,179.32
  4. Step 4: Simplify right side
    12,578.90x = 97,736,929.74
  5. Step 5: Solve for x
    x = 97,736,929.74/12,578.90
  6. Step 6: Final answer
    x = 7,769.91

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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.