Home / 21,013.08-31,519.60-5,430.70

Finding the Fourth Proportional to 21,013.08, 31,519.60 and 5,430.70

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Solution

The fourth proportional to 21,013.08, 31,519.60 and 5,430.70 is: 8,146.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.08 : 31,519.60 = 5,430.70 : x
  2. Step 2: Convert to fraction form
    21,013.08/31,519.60 = 5,430.70/x
  3. Step 3: Cross multiply
    21,013.08x = 31,519.60 × 5,430.70
  4. Step 4: Simplify right side
    21,013.08x = 171,173,491.72
  5. Step 5: Solve for x
    x = 171,173,491.72/21,013.08
  6. Step 6: Final answer
    x = 8,146.04

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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.