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Finding the Fourth Proportional to 8,869.40, 12,239.32 and 4,890.40

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Solution

The fourth proportional to 8,869.40, 12,239.32 and 4,890.40 is: 6,748.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,869.40 : 12,239.32 = 4,890.40 : x
  2. Step 2: Convert to fraction form
    8,869.40/12,239.32 = 4,890.40/x
  3. Step 3: Cross multiply
    8,869.40x = 12,239.32 × 4,890.40
  4. Step 4: Simplify right side
    8,869.40x = 59,855,170.53
  5. Step 5: Solve for x
    x = 59,855,170.53/8,869.40
  6. Step 6: Final answer
    x = 6,748.50

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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.