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Finding the Fourth Proportional to 7,185, 9,915.68 and 4,202.58

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Solution

The fourth proportional to 7,185, 9,915.68 and 4,202.58 is: 5,799.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,185 : 9,915.68 = 4,202.58 : x
  2. Step 2: Convert to fraction form
    7,185/9,915.68 = 4,202.58/x
  3. Step 3: Cross multiply
    7,185x = 9,915.68 × 4,202.58
  4. Step 4: Simplify right side
    7,185x = 41,671,438.45
  5. Step 5: Solve for x
    x = 41,671,438.45/7,185
  6. Step 6: Final answer
    x = 5,799.78

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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.