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Finding the Fourth Proportional to 8,978.18, 12,390.09 and 4,999.70

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Solution

The fourth proportional to 8,978.18, 12,390.09 and 4,999.70 is: 6,899.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.18 : 12,390.09 = 4,999.70 : x
  2. Step 2: Convert to fraction form
    8,978.18/12,390.09 = 4,999.70/x
  3. Step 3: Cross multiply
    8,978.18x = 12,390.09 × 4,999.70
  4. Step 4: Simplify right side
    8,978.18x = 61,946,732.97
  5. Step 5: Solve for x
    x = 61,946,732.97/8,978.18
  6. Step 6: Final answer
    x = 6,899.70

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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.