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Finding the Fourth Proportional to 8,703.30, 12,991.25 and 7,478.58

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Solution

The fourth proportional to 8,703.30, 12,991.25 and 7,478.58 is: 11,163.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,703.30 : 12,991.25 = 7,478.58 : x
  2. Step 2: Convert to fraction form
    8,703.30/12,991.25 = 7,478.58/x
  3. Step 3: Cross multiply
    8,703.30x = 12,991.25 × 7,478.58
  4. Step 4: Simplify right side
    8,703.30x = 97,156,102.43
  5. Step 5: Solve for x
    x = 97,156,102.43/8,703.30
  6. Step 6: Final answer
    x = 11,163.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.