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Finding the Fourth Proportional to 7,215.39, 9,957.21 and 3,903.39

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Solution

The fourth proportional to 7,215.39, 9,957.21 and 3,903.39 is: 5,386.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,215.39 : 9,957.21 = 3,903.39 : x
  2. Step 2: Convert to fraction form
    7,215.39/9,957.21 = 3,903.39/x
  3. Step 3: Cross multiply
    7,215.39x = 9,957.21 × 3,903.39
  4. Step 4: Simplify right side
    7,215.39x = 38,866,873.94
  5. Step 5: Solve for x
    x = 38,866,873.94/7,215.39
  6. Step 6: Final answer
    x = 5,386.66

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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.