Home / 20,990.61-31,484.84-7,841.95

Finding the Fourth Proportional to 20,990.61, 31,484.84 and 7,841.95

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Solution

The fourth proportional to 20,990.61, 31,484.84 and 7,841.95 is: 11,762.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.61 : 31,484.84 = 7,841.95 : x
  2. Step 2: Convert to fraction form
    20,990.61/31,484.84 = 7,841.95/x
  3. Step 3: Cross multiply
    20,990.61x = 31,484.84 × 7,841.95
  4. Step 4: Simplify right side
    20,990.61x = 246,902,423.12
  5. Step 5: Solve for x
    x = 246,902,423.12/20,990.61
  6. Step 6: Final answer
    x = 11,762.52

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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.