Home / 21,270.50-31,905.75-5,687.72

Finding the Fourth Proportional to 21,270.50, 31,905.75 and 5,687.72

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Solution

The fourth proportional to 21,270.50, 31,905.75 and 5,687.72 is: 8,531.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.50 : 31,905.75 = 5,687.72 : x
  2. Step 2: Convert to fraction form
    21,270.50/31,905.75 = 5,687.72/x
  3. Step 3: Cross multiply
    21,270.50x = 31,905.75 × 5,687.72
  4. Step 4: Simplify right side
    21,270.50x = 181,470,921.84
  5. Step 5: Solve for x
    x = 181,470,921.84/21,270.50
  6. Step 6: Final answer
    x = 8,531.58

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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.