Home / 21,130.75-31,705.01-9,278.42

Finding the Fourth Proportional to 21,130.75, 31,705.01 and 9,278.42

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Solution

The fourth proportional to 21,130.75, 31,705.01 and 9,278.42 is: 13,921.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,130.75 : 31,705.01 = 9,278.42 : x
  2. Step 2: Convert to fraction form
    21,130.75/31,705.01 = 9,278.42/x
  3. Step 3: Cross multiply
    21,130.75x = 31,705.01 × 9,278.42
  4. Step 4: Simplify right side
    21,130.75x = 294,172,352.49
  5. Step 5: Solve for x
    x = 294,172,352.49/21,130.75
  6. Step 6: Final answer
    x = 13,921.53

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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.