Home / 15,390.91-21,234.73-9,416.35

Finding the Fourth Proportional to 15,390.91, 21,234.73 and 9,416.35

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Solution

The fourth proportional to 15,390.91, 21,234.73 and 9,416.35 is: 12,991.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,390.91 : 21,234.73 = 9,416.35 : x
  2. Step 2: Convert to fraction form
    15,390.91/21,234.73 = 9,416.35/x
  3. Step 3: Cross multiply
    15,390.91x = 21,234.73 × 9,416.35
  4. Step 4: Simplify right side
    15,390.91x = 199,953,649.84
  5. Step 5: Solve for x
    x = 199,953,649.84/15,390.91
  6. Step 6: Final answer
    x = 12,991.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.