Home / 20,970.08-31,455.12-5,387.72

Finding the Fourth Proportional to 20,970.08, 31,455.12 and 5,387.72

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Solution

The fourth proportional to 20,970.08, 31,455.12 and 5,387.72 is: 8,081.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.08 : 31,455.12 = 5,387.72 : x
  2. Step 2: Convert to fraction form
    20,970.08/31,455.12 = 5,387.72/x
  3. Step 3: Cross multiply
    20,970.08x = 31,455.12 × 5,387.72
  4. Step 4: Simplify right side
    20,970.08x = 169,471,379.13
  5. Step 5: Solve for x
    x = 169,471,379.13/20,970.08
  6. Step 6: Final answer
    x = 8,081.58

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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.