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Finding the Fourth Proportional to 7,985.61, 11,978.42 and 3,056.76

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Solution

The fourth proportional to 7,985.61, 11,978.42 and 3,056.76 is: 4,585.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,985.61 : 11,978.42 = 3,056.76 : x
  2. Step 2: Convert to fraction form
    7,985.61/11,978.42 = 3,056.76/x
  3. Step 3: Cross multiply
    7,985.61x = 11,978.42 × 3,056.76
  4. Step 4: Simplify right side
    7,985.61x = 36,615,155.12
  5. Step 5: Solve for x
    x = 36,615,155.12/7,985.61
  6. Step 6: Final answer
    x = 4,585.14

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Similar ratio
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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.