Home / 20,919.47-31,381.02-6,875.28

Finding the Fourth Proportional to 20,919.47, 31,381.02 and 6,875.28

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Solution

The fourth proportional to 20,919.47, 31,381.02 and 6,875.28 is: 10,313.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.47 : 31,381.02 = 6,875.28 : x
  2. Step 2: Convert to fraction form
    20,919.47/31,381.02 = 6,875.28/x
  3. Step 3: Cross multiply
    20,919.47x = 31,381.02 × 6,875.28
  4. Step 4: Simplify right side
    20,919.47x = 215,753,299.19
  5. Step 5: Solve for x
    x = 215,753,299.19/20,919.47
  6. Step 6: Final answer
    x = 10,313.52

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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.