Home / 10,921.40-16,390.20-7,218.08

Finding the Fourth Proportional to 10,921.40, 16,390.20 and 7,218.08

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Solution

The fourth proportional to 10,921.40, 16,390.20 and 7,218.08 is: 10,832.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,921.40 : 16,390.20 = 7,218.08 : x
  2. Step 2: Convert to fraction form
    10,921.40/16,390.20 = 7,218.08/x
  3. Step 3: Cross multiply
    10,921.40x = 16,390.20 × 7,218.08
  4. Step 4: Simplify right side
    10,921.40x = 118,305,774.82
  5. Step 5: Solve for x
    x = 118,305,774.82/10,921.40
  6. Step 6: Final answer
    x = 10,832.47

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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.