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Finding the Fourth Proportional to 5,985.60, 8,978.40 and 5,645.40

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Solution

The fourth proportional to 5,985.60, 8,978.40 and 5,645.40 is: 8,468.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,985.60 : 8,978.40 = 5,645.40 : x
  2. Step 2: Convert to fraction form
    5,985.60/8,978.40 = 5,645.40/x
  3. Step 3: Cross multiply
    5,985.60x = 8,978.40 × 5,645.40
  4. Step 4: Simplify right side
    5,985.60x = 50,686,659.36
  5. Step 5: Solve for x
    x = 50,686,659.36/5,985.60
  6. Step 6: Final answer
    x = 8,468.10

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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.