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Finding the Fourth Proportional to 128,048.80, 191,828.40 and 68,864.80

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Solution

The fourth proportional to 128,048.80, 191,828.40 and 68,864.80 is: 103,165.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,048.80 : 191,828.40 = 68,864.80 : x
  2. Step 2: Convert to fraction form
    128,048.80/191,828.40 = 68,864.80/x
  3. Step 3: Cross multiply
    128,048.80x = 191,828.40 × 68,864.80
  4. Step 4: Simplify right side
    128,048.80x = 13,210,224,400.32
  5. Step 5: Solve for x
    x = 13,210,224,400.32/128,048.80
  6. Step 6: Final answer
    x = 103,165.55

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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.