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Finding the Fourth Proportional to 7,840.60, 11,760.90 and 2,646.40

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Solution

The fourth proportional to 7,840.60, 11,760.90 and 2,646.40 is: 3,969.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,840.60 : 11,760.90 = 2,646.40 : x
  2. Step 2: Convert to fraction form
    7,840.60/11,760.90 = 2,646.40/x
  3. Step 3: Cross multiply
    7,840.60x = 11,760.90 × 2,646.40
  4. Step 4: Simplify right side
    7,840.60x = 31,124,045.76
  5. Step 5: Solve for x
    x = 31,124,045.76/7,840.60
  6. Step 6: Final answer
    x = 3,969.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.