Home / 21,010.60-31,512.30-7,856.20

Finding the Fourth Proportional to 21,010.60, 31,512.30 and 7,856.20

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Solution

The fourth proportional to 21,010.60, 31,512.30 and 7,856.20 is: 11,782.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.60 : 31,512.30 = 7,856.20 : x
  2. Step 2: Convert to fraction form
    21,010.60/31,512.30 = 7,856.20/x
  3. Step 3: Cross multiply
    21,010.60x = 31,512.30 × 7,856.20
  4. Step 4: Simplify right side
    21,010.60x = 247,566,931.26
  5. Step 5: Solve for x
    x = 247,566,931.26/21,010.60
  6. Step 6: Final answer
    x = 11,782.95

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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.