Home / 78,857.30-118,285.95-72,406.10

Finding the Fourth Proportional to 78,857.30, 118,285.95 and 72,406.10

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Solution

The fourth proportional to 78,857.30, 118,285.95 and 72,406.10 is: 108,609.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,857.30 : 118,285.95 = 72,406.10 : x
  2. Step 2: Convert to fraction form
    78,857.30/118,285.95 = 72,406.10/x
  3. Step 3: Cross multiply
    78,857.30x = 118,285.95 × 72,406.10
  4. Step 4: Simplify right side
    78,857.30x = 8,564,624,324.30
  5. Step 5: Solve for x
    x = 8,564,624,324.30/78,857.30
  6. Step 6: Final answer
    x = 108,609.15

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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.