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Finding the Fourth Proportional to 10,315.80, 15,472.80 and 3,390.30

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Solution

The fourth proportional to 10,315.80, 15,472.80 and 3,390.30 is: 5,085.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,315.80 : 15,472.80 = 3,390.30 : x
  2. Step 2: Convert to fraction form
    10,315.80/15,472.80 = 3,390.30/x
  3. Step 3: Cross multiply
    10,315.80x = 15,472.80 × 3,390.30
  4. Step 4: Simplify right side
    10,315.80x = 52,457,433.84
  5. Step 5: Solve for x
    x = 52,457,433.84/10,315.80
  6. Step 6: Final answer
    x = 5,085.15

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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.