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Finding the Fourth Proportional to 72,696.80, 109,045.20 and 47,813.60

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Solution

The fourth proportional to 72,696.80, 109,045.20 and 47,813.60 is: 71,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,696.80 : 109,045.20 = 47,813.60 : x
  2. Step 2: Convert to fraction form
    72,696.80/109,045.20 = 47,813.60/x
  3. Step 3: Cross multiply
    72,696.80x = 109,045.20 × 47,813.60
  4. Step 4: Simplify right side
    72,696.80x = 5,213,843,574.72
  5. Step 5: Solve for x
    x = 5,213,843,574.72/72,696.80
  6. Step 6: Final answer
    x = 71,720.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.