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Finding the Fourth Proportional to 3,579.84, 5,370 and 1,239.72

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Solution

The fourth proportional to 3,579.84, 5,370 and 1,239.72 is: 1,859.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,579.84 : 5,370 = 1,239.72 : x
  2. Step 2: Convert to fraction form
    3,579.84/5,370 = 1,239.72/x
  3. Step 3: Cross multiply
    3,579.84x = 5,370 × 1,239.72
  4. Step 4: Simplify right side
    3,579.84x = 6,657,296.40
  5. Step 5: Solve for x
    x = 6,657,296.40/3,579.84
  6. Step 6: Final answer
    x = 1,859.66

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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.