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Finding the Fourth Proportional to 8,979.86, 13,405.62 and 8,386.94

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Solution

The fourth proportional to 8,979.86, 13,405.62 and 8,386.94 is: 12,520.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.86 : 13,405.62 = 8,386.94 : x
  2. Step 2: Convert to fraction form
    8,979.86/13,405.62 = 8,386.94/x
  3. Step 3: Cross multiply
    8,979.86x = 13,405.62 × 8,386.94
  4. Step 4: Simplify right side
    8,979.86x = 112,432,130.60
  5. Step 5: Solve for x
    x = 112,432,130.60/8,979.86
  6. Step 6: Final answer
    x = 12,520.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.