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Finding the Fourth Proportional to 9,985.75, 13,780.31 and 5,509.49

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Solution

The fourth proportional to 9,985.75, 13,780.31 and 5,509.49 is: 7,603.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,985.75 : 13,780.31 = 5,509.49 : x
  2. Step 2: Convert to fraction form
    9,985.75/13,780.31 = 5,509.49/x
  3. Step 3: Cross multiply
    9,985.75x = 13,780.31 × 5,509.49
  4. Step 4: Simplify right side
    9,985.75x = 75,922,411.24
  5. Step 5: Solve for x
    x = 75,922,411.24/9,985.75
  6. Step 6: Final answer
    x = 7,603.08

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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.