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Finding the Fourth Proportional to 8,390.40, 11,580 and 4,853.76

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Solution

The fourth proportional to 8,390.40, 11,580 and 4,853.76 is: 6,698.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.40 : 11,580 = 4,853.76 : x
  2. Step 2: Convert to fraction form
    8,390.40/11,580 = 4,853.76/x
  3. Step 3: Cross multiply
    8,390.40x = 11,580 × 4,853.76
  4. Step 4: Simplify right side
    8,390.40x = 56,206,540.80
  5. Step 5: Solve for x
    x = 56,206,540.80/8,390.40
  6. Step 6: Final answer
    x = 6,698.91

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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.