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Finding the Fourth Proportional to 78,696.80, 118,045.20 and 72,281.60

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Solution

The fourth proportional to 78,696.80, 118,045.20 and 72,281.60 is: 108,422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,696.80 : 118,045.20 = 72,281.60 : x
  2. Step 2: Convert to fraction form
    78,696.80/118,045.20 = 72,281.60/x
  3. Step 3: Cross multiply
    78,696.80x = 118,045.20 × 72,281.60
  4. Step 4: Simplify right side
    78,696.80x = 8,532,495,928.32
  5. Step 5: Solve for x
    x = 8,532,495,928.32/78,696.80
  6. Step 6: Final answer
    x = 108,422.40

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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.