Home / 20,772.90-28,666.40-12,811.94

Finding the Fourth Proportional to 20,772.90, 28,666.40 and 12,811.94

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Solution

The fourth proportional to 20,772.90, 28,666.40 and 12,811.94 is: 17,680.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.90 : 28,666.40 = 12,811.94 : x
  2. Step 2: Convert to fraction form
    20,772.90/28,666.40 = 12,811.94/x
  3. Step 3: Cross multiply
    20,772.90x = 28,666.40 × 12,811.94
  4. Step 4: Simplify right side
    20,772.90x = 367,272,196.82
  5. Step 5: Solve for x
    x = 367,272,196.82/20,772.90
  6. Step 6: Final answer
    x = 17,680.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.