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Finding the Fourth Proportional to 7,113.63, 9,816.81 and 3,970.42

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Solution

The fourth proportional to 7,113.63, 9,816.81 and 3,970.42 is: 5,479.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,113.63 : 9,816.81 = 3,970.42 : x
  2. Step 2: Convert to fraction form
    7,113.63/9,816.81 = 3,970.42/x
  3. Step 3: Cross multiply
    7,113.63x = 9,816.81 × 3,970.42
  4. Step 4: Simplify right side
    7,113.63x = 38,976,858.76
  5. Step 5: Solve for x
    x = 38,976,858.76/7,113.63
  6. Step 6: Final answer
    x = 5,479.18

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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.