Home / 21,171.38-31,771.64-7,320.38

Finding the Fourth Proportional to 21,171.38, 31,771.64 and 7,320.38

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Solution

The fourth proportional to 21,171.38, 31,771.64 and 7,320.38 is: 10,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,171.38 : 31,771.64 = 7,320.38 : x
  2. Step 2: Convert to fraction form
    21,171.38/31,771.64 = 7,320.38/x
  3. Step 3: Cross multiply
    21,171.38x = 31,771.64 × 7,320.38
  4. Step 4: Simplify right side
    21,171.38x = 232,580,337.47
  5. Step 5: Solve for x
    x = 232,580,337.47/21,171.38
  6. Step 6: Final answer
    x = 10,985.60

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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.