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Finding the Fourth Proportional to 9,989.40, 14,982.90 and 4,145.40

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Solution

The fourth proportional to 9,989.40, 14,982.90 and 4,145.40 is: 6,217.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,989.40 : 14,982.90 = 4,145.40 : x
  2. Step 2: Convert to fraction form
    9,989.40/14,982.90 = 4,145.40/x
  3. Step 3: Cross multiply
    9,989.40x = 14,982.90 × 4,145.40
  4. Step 4: Simplify right side
    9,989.40x = 62,110,113.66
  5. Step 5: Solve for x
    x = 62,110,113.66/9,989.40
  6. Step 6: Final answer
    x = 6,217.60

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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.