Home / 20,987.60-31,477.80-7,833.20

Finding the Fourth Proportional to 20,987.60, 31,477.80 and 7,833.20

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Solution

The fourth proportional to 20,987.60, 31,477.80 and 7,833.20 is: 11,748.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.60 : 31,477.80 = 7,833.20 : x
  2. Step 2: Convert to fraction form
    20,987.60/31,477.80 = 7,833.20/x
  3. Step 3: Cross multiply
    20,987.60x = 31,477.80 × 7,833.20
  4. Step 4: Simplify right side
    20,987.60x = 246,571,902.96
  5. Step 5: Solve for x
    x = 246,571,902.96/20,987.60
  6. Step 6: Final answer
    x = 11,748.46

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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.