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Finding the Fourth Proportional to 8,436.84, 12,636.21 and 4,921.58

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Solution

The fourth proportional to 8,436.84, 12,636.21 and 4,921.58 is: 7,371.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,436.84 : 12,636.21 = 4,921.58 : x
  2. Step 2: Convert to fraction form
    8,436.84/12,636.21 = 4,921.58/x
  3. Step 3: Cross multiply
    8,436.84x = 12,636.21 × 4,921.58
  4. Step 4: Simplify right side
    8,436.84x = 62,190,055.23
  5. Step 5: Solve for x
    x = 62,190,055.23/8,436.84
  6. Step 6: Final answer
    x = 7,371.25

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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.