Home / 21,039.60-31,436.15-20,303.78

Finding the Fourth Proportional to 21,039.60, 31,436.15 and 20,303.78

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Solution

The fourth proportional to 21,039.60, 31,436.15 and 20,303.78 is: 30,336.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.60 : 31,436.15 = 20,303.78 : x
  2. Step 2: Convert to fraction form
    21,039.60/31,436.15 = 20,303.78/x
  3. Step 3: Cross multiply
    21,039.60x = 31,436.15 × 20,303.78
  4. Step 4: Simplify right side
    21,039.60x = 638,272,803.00
  5. Step 5: Solve for x
    x = 638,272,803.00/21,039.60
  6. Step 6: Final answer
    x = 30,336.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.