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Finding the Fourth Proportional to 128,172.68, 192,280.88 and 39,424.22

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Solution

The fourth proportional to 128,172.68, 192,280.88 and 39,424.22 is: 59,143.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,172.68 : 192,280.88 = 39,424.22 : x
  2. Step 2: Convert to fraction form
    128,172.68/192,280.88 = 39,424.22/x
  3. Step 3: Cross multiply
    128,172.68x = 192,280.88 × 39,424.22
  4. Step 4: Simplify right side
    128,172.68x = 7,580,522,753.51
  5. Step 5: Solve for x
    x = 7,580,522,753.51/128,172.68
  6. Step 6: Final answer
    x = 59,143.05

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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.