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Finding the Fourth Proportional to 7,215.76, 9,957.90 and 3,985.57

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Solution

The fourth proportional to 7,215.76, 9,957.90 and 3,985.57 is: 5,500.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,215.76 : 9,957.90 = 3,985.57 : x
  2. Step 2: Convert to fraction form
    7,215.76/9,957.90 = 3,985.57/x
  3. Step 3: Cross multiply
    7,215.76x = 9,957.90 × 3,985.57
  4. Step 4: Simplify right side
    7,215.76x = 39,687,907.50
  5. Step 5: Solve for x
    x = 39,687,907.50/7,215.76
  6. Step 6: Final answer
    x = 5,500.17

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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.