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Finding the Fourth Proportional to 7,978.15, 10,998.44 and 5,612.95

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Solution

The fourth proportional to 7,978.15, 10,998.44 and 5,612.95 is: 7,737.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.15 : 10,998.44 = 5,612.95 : x
  2. Step 2: Convert to fraction form
    7,978.15/10,998.44 = 5,612.95/x
  3. Step 3: Cross multiply
    7,978.15x = 10,998.44 × 5,612.95
  4. Step 4: Simplify right side
    7,978.15x = 61,733,693.80
  5. Step 5: Solve for x
    x = 61,733,693.80/7,978.15
  6. Step 6: Final answer
    x = 7,737.85

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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.