Home / 20,970.09-31,455.54-5,387.31

Finding the Fourth Proportional to 20,970.09, 31,455.54 and 5,387.31

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Solution

The fourth proportional to 20,970.09, 31,455.54 and 5,387.31 is: 8,081.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.09 : 31,455.54 = 5,387.31 : x
  2. Step 2: Convert to fraction form
    20,970.09/31,455.54 = 5,387.31/x
  3. Step 3: Cross multiply
    20,970.09x = 31,455.54 × 5,387.31
  4. Step 4: Simplify right side
    20,970.09x = 169,460,745.20
  5. Step 5: Solve for x
    x = 169,460,745.20/20,970.09
  6. Step 6: Final answer
    x = 8,081.07

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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.