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Finding the Fourth Proportional to 6,870.09, 9,479.15 and 3,885.28

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Solution

The fourth proportional to 6,870.09, 9,479.15 and 3,885.28 is: 5,360.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,870.09 : 9,479.15 = 3,885.28 : x
  2. Step 2: Convert to fraction form
    6,870.09/9,479.15 = 3,885.28/x
  3. Step 3: Cross multiply
    6,870.09x = 9,479.15 × 3,885.28
  4. Step 4: Simplify right side
    6,870.09x = 36,829,108.79
  5. Step 5: Solve for x
    x = 36,829,108.79/6,870.09
  6. Step 6: Final answer
    x = 5,360.79

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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.