Home / 20,771.90-28,665.02-12,810.94

Finding the Fourth Proportional to 20,771.90, 28,665.02 and 12,810.94

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Solution

The fourth proportional to 20,771.90, 28,665.02 and 12,810.94 is: 17,678.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771.90 : 28,665.02 = 12,810.94 : x
  2. Step 2: Convert to fraction form
    20,771.90/28,665.02 = 12,810.94/x
  3. Step 3: Cross multiply
    20,771.90x = 28,665.02 × 12,810.94
  4. Step 4: Simplify right side
    20,771.90x = 367,225,851.32
  5. Step 5: Solve for x
    x = 367,225,851.32/20,771.90
  6. Step 6: Final answer
    x = 17,678.97

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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.