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Finding the Fourth Proportional to 284,143.74, 392,119.20 and 155,083.40

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Solution

The fourth proportional to 284,143.74, 392,119.20 and 155,083.40 is: 214,015.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    284,143.74 : 392,119.20 = 155,083.40 : x
  2. Step 2: Convert to fraction form
    284,143.74/392,119.20 = 155,083.40/x
  3. Step 3: Cross multiply
    284,143.74x = 392,119.20 × 155,083.40
  4. Step 4: Simplify right side
    284,143.74x = 60,811,178,251.13
  5. Step 5: Solve for x
    x = 60,811,178,251.13/284,143.74
  6. Step 6: Final answer
    x = 214,015.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.