Home / 20,911.60-31,341.80-9,212.40

Finding the Fourth Proportional to 20,911.60, 31,341.80 and 9,212.40

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Solution

The fourth proportional to 20,911.60, 31,341.80 and 9,212.40 is: 13,807.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.60 : 31,341.80 = 9,212.40 : x
  2. Step 2: Convert to fraction form
    20,911.60/31,341.80 = 9,212.40/x
  3. Step 3: Cross multiply
    20,911.60x = 31,341.80 × 9,212.40
  4. Step 4: Simplify right side
    20,911.60x = 288,733,198.32
  5. Step 5: Solve for x
    x = 288,733,198.32/20,911.60
  6. Step 6: Final answer
    x = 13,807.32

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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.