Home / 20,953.12-31,429.60-8,472.99

Finding the Fourth Proportional to 20,953.12, 31,429.60 and 8,472.99

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Solution

The fourth proportional to 20,953.12, 31,429.60 and 8,472.99 is: 12,709.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,953.12 : 31,429.60 = 8,472.99 : x
  2. Step 2: Convert to fraction form
    20,953.12/31,429.60 = 8,472.99/x
  3. Step 3: Cross multiply
    20,953.12x = 31,429.60 × 8,472.99
  4. Step 4: Simplify right side
    20,953.12x = 266,302,686.50
  5. Step 5: Solve for x
    x = 266,302,686.50/20,953.12
  6. Step 6: Final answer
    x = 12,709.45

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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.