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Finding the Fourth Proportional to 8,985.78, 12,399.93 and 6,745.86

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Solution

The fourth proportional to 8,985.78, 12,399.93 and 6,745.86 is: 9,308.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,985.78 : 12,399.93 = 6,745.86 : x
  2. Step 2: Convert to fraction form
    8,985.78/12,399.93 = 6,745.86/x
  3. Step 3: Cross multiply
    8,985.78x = 12,399.93 × 6,745.86
  4. Step 4: Simplify right side
    8,985.78x = 83,648,191.79
  5. Step 5: Solve for x
    x = 83,648,191.79/8,985.78
  6. Step 6: Final answer
    x = 9,308.95

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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.