Home / 20,901.69-31,319.73-12,561.93

Finding the Fourth Proportional to 20,901.69, 31,319.73 and 12,561.93

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Solution

The fourth proportional to 20,901.69, 31,319.73 and 12,561.93 is: 18,823.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,901.69 : 31,319.73 = 12,561.93 : x
  2. Step 2: Convert to fraction form
    20,901.69/31,319.73 = 12,561.93/x
  3. Step 3: Cross multiply
    20,901.69x = 31,319.73 × 12,561.93
  4. Step 4: Simplify right side
    20,901.69x = 393,436,255.88
  5. Step 5: Solve for x
    x = 393,436,255.88/20,901.69
  6. Step 6: Final answer
    x = 18,823.18

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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.