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Finding the Fourth Proportional to 78,868,513.80, 118,302,770.70 and 65,431,585.80

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Solution

The fourth proportional to 78,868,513.80, 118,302,770.70 and 65,431,585.80 is: 98,147,378.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,868,513.80 : 118,302,770.70 = 65,431,585.80 : x
  2. Step 2: Convert to fraction form
    78,868,513.80/118,302,770.70 = 65,431,585.80/x
  3. Step 3: Cross multiply
    78,868,513.80x = 118,302,770.70 × 65,431,585.80
  4. Step 4: Simplify right side
    78,868,513.80x = 7,740,737,891,434,776
  5. Step 5: Solve for x
    x = 7,740,737,891,434,776/78,868,513.80
  6. Step 6: Final answer
    x = 98,147,378.70

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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.