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Finding the Fourth Proportional to 78,611.04, 108,458.91 and 47,990.70

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Solution

The fourth proportional to 78,611.04, 108,458.91 and 47,990.70 is: 66,212.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,611.04 : 108,458.91 = 47,990.70 : x
  2. Step 2: Convert to fraction form
    78,611.04/108,458.91 = 47,990.70/x
  3. Step 3: Cross multiply
    78,611.04x = 108,458.91 × 47,990.70
  4. Step 4: Simplify right side
    78,611.04x = 5,205,019,012.14
  5. Step 5: Solve for x
    x = 5,205,019,012.14/78,611.04
  6. Step 6: Final answer
    x = 66,212.32

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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.