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Finding the Fourth Proportional to 39,108.80, 58,663.20 and 12,807.20

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Solution

The fourth proportional to 39,108.80, 58,663.20 and 12,807.20 is: 19,210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,108.80 : 58,663.20 = 12,807.20 : x
  2. Step 2: Convert to fraction form
    39,108.80/58,663.20 = 12,807.20/x
  3. Step 3: Cross multiply
    39,108.80x = 58,663.20 × 12,807.20
  4. Step 4: Simplify right side
    39,108.80x = 751,311,335.04
  5. Step 5: Solve for x
    x = 751,311,335.04/39,108.80
  6. Step 6: Final answer
    x = 19,210.80

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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.