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Finding the Fourth Proportional to 12,990.66, 19,486.08 and 7,144.08

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Solution

The fourth proportional to 12,990.66, 19,486.08 and 7,144.08 is: 10,716.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.66 : 19,486.08 = 7,144.08 : x
  2. Step 2: Convert to fraction form
    12,990.66/19,486.08 = 7,144.08/x
  3. Step 3: Cross multiply
    12,990.66x = 19,486.08 × 7,144.08
  4. Step 4: Simplify right side
    12,990.66x = 139,210,114.41
  5. Step 5: Solve for x
    x = 139,210,114.41/12,990.66
  6. Step 6: Final answer
    x = 10,716.17

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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.