Home / 21,020.40-31,530.56-7,878.96

Finding the Fourth Proportional to 21,020.40, 31,530.56 and 7,878.96

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Solution

The fourth proportional to 21,020.40, 31,530.56 and 7,878.96 is: 11,818.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.40 : 31,530.56 = 7,878.96 : x
  2. Step 2: Convert to fraction form
    21,020.40/31,530.56 = 7,878.96/x
  3. Step 3: Cross multiply
    21,020.40x = 31,530.56 × 7,878.96
  4. Step 4: Simplify right side
    21,020.40x = 248,428,021.02
  5. Step 5: Solve for x
    x = 248,428,021.02/21,020.40
  6. Step 6: Final answer
    x = 11,818.43

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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.