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Finding the Fourth Proportional to 3,988.17, 5,982.93 and 1,390.50

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Solution

The fourth proportional to 3,988.17, 5,982.93 and 1,390.50 is: 2,085.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.17 : 5,982.93 = 1,390.50 : x
  2. Step 2: Convert to fraction form
    3,988.17/5,982.93 = 1,390.50/x
  3. Step 3: Cross multiply
    3,988.17x = 5,982.93 × 1,390.50
  4. Step 4: Simplify right side
    3,988.17x = 8,319,264.17
  5. Step 5: Solve for x
    x = 8,319,264.17/3,988.17
  6. Step 6: Final answer
    x = 2,085.99

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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.