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Finding the Fourth Proportional to 8,428.41, 12,638.71 and 4,919.45

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Solution

The fourth proportional to 8,428.41, 12,638.71 and 4,919.45 is: 7,376.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.41 : 12,638.71 = 4,919.45 : x
  2. Step 2: Convert to fraction form
    8,428.41/12,638.71 = 4,919.45/x
  3. Step 3: Cross multiply
    8,428.41x = 12,638.71 × 4,919.45
  4. Step 4: Simplify right side
    8,428.41x = 62,175,444.87
  5. Step 5: Solve for x
    x = 62,175,444.87/8,428.41
  6. Step 6: Final answer
    x = 7,376.89

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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.