Home / 12,990.08-19,490.52-7,146.20

Finding the Fourth Proportional to 12,990.08, 19,490.52 and 7,146.20

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Solution

The fourth proportional to 12,990.08, 19,490.52 and 7,146.20 is: 10,722.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.08 : 19,490.52 = 7,146.20 : x
  2. Step 2: Convert to fraction form
    12,990.08/19,490.52 = 7,146.20/x
  3. Step 3: Cross multiply
    12,990.08x = 19,490.52 × 7,146.20
  4. Step 4: Simplify right side
    12,990.08x = 139,283,154.02
  5. Step 5: Solve for x
    x = 139,283,154.02/12,990.08
  6. Step 6: Final answer
    x = 10,722.27

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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.