Home / 21,314.40-31,971.60-19,200.30

Finding the Fourth Proportional to 21,314.40, 31,971.60 and 19,200.30

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Solution

The fourth proportional to 21,314.40, 31,971.60 and 19,200.30 is: 28,800.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,314.40 : 31,971.60 = 19,200.30 : x
  2. Step 2: Convert to fraction form
    21,314.40/31,971.60 = 19,200.30/x
  3. Step 3: Cross multiply
    21,314.40x = 31,971.60 × 19,200.30
  4. Step 4: Simplify right side
    21,314.40x = 613,864,311.48
  5. Step 5: Solve for x
    x = 613,864,311.48/21,314.40
  6. Step 6: Final answer
    x = 28,800.45

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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.