Home / 21,005.55-31,509.20-9,771.44

Finding the Fourth Proportional to 21,005.55, 31,509.20 and 9,771.44

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Solution

The fourth proportional to 21,005.55, 31,509.20 and 9,771.44 is: 14,657.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.55 : 31,509.20 = 9,771.44 : x
  2. Step 2: Convert to fraction form
    21,005.55/31,509.20 = 9,771.44/x
  3. Step 3: Cross multiply
    21,005.55x = 31,509.20 × 9,771.44
  4. Step 4: Simplify right side
    21,005.55x = 307,890,050.84
  5. Step 5: Solve for x
    x = 307,890,050.84/21,005.55
  6. Step 6: Final answer
    x = 14,657.56

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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.