Home / 20,784.80-31,177.20-7,637.60

Finding the Fourth Proportional to 20,784.80, 31,177.20 and 7,637.60

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Solution

The fourth proportional to 20,784.80, 31,177.20 and 7,637.60 is: 11,456.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,784.80 : 31,177.20 = 7,637.60 : x
  2. Step 2: Convert to fraction form
    20,784.80/31,177.20 = 7,637.60/x
  3. Step 3: Cross multiply
    20,784.80x = 31,177.20 × 7,637.60
  4. Step 4: Simplify right side
    20,784.80x = 238,118,982.72
  5. Step 5: Solve for x
    x = 238,118,982.72/20,784.80
  6. Step 6: Final answer
    x = 11,456.40

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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.