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Finding the Fourth Proportional to 78,890.80, 118,105.80 and 70,596.40

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Solution

The fourth proportional to 78,890.80, 118,105.80 and 70,596.40 is: 105,688.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,890.80 : 118,105.80 = 70,596.40 : x
  2. Step 2: Convert to fraction form
    78,890.80/118,105.80 = 70,596.40/x
  3. Step 3: Cross multiply
    78,890.80x = 118,105.80 × 70,596.40
  4. Step 4: Simplify right side
    78,890.80x = 8,337,844,299.12
  5. Step 5: Solve for x
    x = 8,337,844,299.12/78,890.80
  6. Step 6: Final answer
    x = 105,688.42

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1.5x scale

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.