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Finding the Fourth Proportional to 12,281.40, 18,408.98 and 7,005.05

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Solution

The fourth proportional to 12,281.40, 18,408.98 and 7,005.05 is: 10,500.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,281.40 : 18,408.98 = 7,005.05 : x
  2. Step 2: Convert to fraction form
    12,281.40/18,408.98 = 7,005.05/x
  3. Step 3: Cross multiply
    12,281.40x = 18,408.98 × 7,005.05
  4. Step 4: Simplify right side
    12,281.40x = 128,955,825.35
  5. Step 5: Solve for x
    x = 128,955,825.35/12,281.40
  6. Step 6: Final answer
    x = 10,500.09

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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.