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Finding the Fourth Proportional to 7,172.48, 9,897.86 and 3,985.76

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Solution

The fourth proportional to 7,172.48, 9,897.86 and 3,985.76 is: 5,500.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172.48 : 9,897.86 = 3,985.76 : x
  2. Step 2: Convert to fraction form
    7,172.48/9,897.86 = 3,985.76/x
  3. Step 3: Cross multiply
    7,172.48x = 9,897.86 × 3,985.76
  4. Step 4: Simplify right side
    7,172.48x = 39,450,494.47
  5. Step 5: Solve for x
    x = 39,450,494.47/7,172.48
  6. Step 6: Final answer
    x = 5,500.26

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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.