Home / 20,970.24-31,455.60-7,120.32

Finding the Fourth Proportional to 20,970.24, 31,455.60 and 7,120.32

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Solution

The fourth proportional to 20,970.24, 31,455.60 and 7,120.32 is: 10,680.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.24 : 31,455.60 = 7,120.32 : x
  2. Step 2: Convert to fraction form
    20,970.24/31,455.60 = 7,120.32/x
  3. Step 3: Cross multiply
    20,970.24x = 31,455.60 × 7,120.32
  4. Step 4: Simplify right side
    20,970.24x = 223,973,937.79
  5. Step 5: Solve for x
    x = 223,973,937.79/20,970.24
  6. Step 6: Final answer
    x = 10,680.56

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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.