Home / 21,139.20-31,712.40-7,100.58

Finding the Fourth Proportional to 21,139.20, 31,712.40 and 7,100.58

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Solution

The fourth proportional to 21,139.20, 31,712.40 and 7,100.58 is: 10,652.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.20 : 31,712.40 = 7,100.58 : x
  2. Step 2: Convert to fraction form
    21,139.20/31,712.40 = 7,100.58/x
  3. Step 3: Cross multiply
    21,139.20x = 31,712.40 × 7,100.58
  4. Step 4: Simplify right side
    21,139.20x = 225,176,433.19
  5. Step 5: Solve for x
    x = 225,176,433.19/21,139.20
  6. Step 6: Final answer
    x = 10,652.08

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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.