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Finding the Fourth Proportional to 8,765.40, 13,148.10 and 8,386.20

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Solution

The fourth proportional to 8,765.40, 13,148.10 and 8,386.20 is: 12,579.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.40 : 13,148.10 = 8,386.20 : x
  2. Step 2: Convert to fraction form
    8,765.40/13,148.10 = 8,386.20/x
  3. Step 3: Cross multiply
    8,765.40x = 13,148.10 × 8,386.20
  4. Step 4: Simplify right side
    8,765.40x = 110,262,596.22
  5. Step 5: Solve for x
    x = 110,262,596.22/8,765.40
  6. Step 6: Final answer
    x = 12,579.30

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Similar ratio
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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.