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Finding the Fourth Proportional to 77,280.80, 115,921.20 and 68,970.20

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Solution

The fourth proportional to 77,280.80, 115,921.20 and 68,970.20 is: 103,455.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,280.80 : 115,921.20 = 68,970.20 : x
  2. Step 2: Convert to fraction form
    77,280.80/115,921.20 = 68,970.20/x
  3. Step 3: Cross multiply
    77,280.80x = 115,921.20 × 68,970.20
  4. Step 4: Simplify right side
    77,280.80x = 7,995,108,348.24
  5. Step 5: Solve for x
    x = 7,995,108,348.24/77,280.80
  6. Step 6: Final answer
    x = 103,455.30

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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.