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Finding the Fourth Proportional to 8,978.70, 12,390.59 and 5,000.16

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Solution

The fourth proportional to 8,978.70, 12,390.59 and 5,000.16 is: 6,900.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.70 : 12,390.59 = 5,000.16 : x
  2. Step 2: Convert to fraction form
    8,978.70/12,390.59 = 5,000.16/x
  3. Step 3: Cross multiply
    8,978.70x = 12,390.59 × 5,000.16
  4. Step 4: Simplify right side
    8,978.70x = 61,954,944.99
  5. Step 5: Solve for x
    x = 61,954,944.99/8,978.70
  6. Step 6: Final answer
    x = 6,900.21

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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.