Home / 21,001.20-31,501.80-19,705.20

Finding the Fourth Proportional to 21,001.20, 31,501.80 and 19,705.20

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Solution

The fourth proportional to 21,001.20, 31,501.80 and 19,705.20 is: 29,557.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.20 : 31,501.80 = 19,705.20 : x
  2. Step 2: Convert to fraction form
    21,001.20/31,501.80 = 19,705.20/x
  3. Step 3: Cross multiply
    21,001.20x = 31,501.80 × 19,705.20
  4. Step 4: Simplify right side
    21,001.20x = 620,749,269.36
  5. Step 5: Solve for x
    x = 620,749,269.36/21,001.20
  6. Step 6: Final answer
    x = 29,557.80

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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.