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Finding the Fourth Proportional to 78,220.91, 117,140.00 and 70,639.31

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Solution

The fourth proportional to 78,220.91, 117,140.00 and 70,639.31 is: 105,786.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,220.91 : 117,140.00 = 70,639.31 : x
  2. Step 2: Convert to fraction form
    78,220.91/117,140.00 = 70,639.31/x
  3. Step 3: Cross multiply
    78,220.91x = 117,140.00 × 70,639.31
  4. Step 4: Simplify right side
    78,220.91x = 8,274,688,948.98
  5. Step 5: Solve for x
    x = 8,274,688,948.98/78,220.91
  6. Step 6: Final answer
    x = 105,786.15

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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.