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Finding the Fourth Proportional to 7,840, 10,809.60 and 6,156.16

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Solution

The fourth proportional to 7,840, 10,809.60 and 6,156.16 is: 8,487.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,840 : 10,809.60 = 6,156.16 : x
  2. Step 2: Convert to fraction form
    7,840/10,809.60 = 6,156.16/x
  3. Step 3: Cross multiply
    7,840x = 10,809.60 × 6,156.16
  4. Step 4: Simplify right side
    7,840x = 66,545,627.14
  5. Step 5: Solve for x
    x = 66,545,627.14/7,840
  6. Step 6: Final answer
    x = 8,487.96

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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.