Home / 21,000.90-31,501.35-7,850.55

Finding the Fourth Proportional to 21,000.90, 31,501.35 and 7,850.55

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Solution

The fourth proportional to 21,000.90, 31,501.35 and 7,850.55 is: 11,775.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.90 : 31,501.35 = 7,850.55 : x
  2. Step 2: Convert to fraction form
    21,000.90/31,501.35 = 7,850.55/x
  3. Step 3: Cross multiply
    21,000.90x = 31,501.35 × 7,850.55
  4. Step 4: Simplify right side
    21,000.90x = 247,302,923.24
  5. Step 5: Solve for x
    x = 247,302,923.24/21,000.90
  6. Step 6: Final answer
    x = 11,775.83

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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.