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Finding the Fourth Proportional to 128,671.47, 192,744.63 and 66,210.75

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Solution

The fourth proportional to 128,671.47, 192,744.63 and 66,210.75 is: 99,181.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,671.47 : 192,744.63 = 66,210.75 : x
  2. Step 2: Convert to fraction form
    128,671.47/192,744.63 = 66,210.75/x
  3. Step 3: Cross multiply
    128,671.47x = 192,744.63 × 66,210.75
  4. Step 4: Simplify right side
    128,671.47x = 12,761,766,510.77
  5. Step 5: Solve for x
    x = 12,761,766,510.77/128,671.47
  6. Step 6: Final answer
    x = 99,181.01

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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.