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Finding the Fourth Proportional to 6,885.90, 9,487.80 and 6,319.71

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Solution

The fourth proportional to 6,885.90, 9,487.80 and 6,319.71 is: 8,707.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,885.90 : 9,487.80 = 6,319.71 : x
  2. Step 2: Convert to fraction form
    6,885.90/9,487.80 = 6,319.71/x
  3. Step 3: Cross multiply
    6,885.90x = 9,487.80 × 6,319.71
  4. Step 4: Simplify right side
    6,885.90x = 59,960,144.54
  5. Step 5: Solve for x
    x = 59,960,144.54/6,885.90
  6. Step 6: Final answer
    x = 8,707.67

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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.