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Finding the Fourth Proportional to 427,551.40, 640,926.15 and 161,490.70

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Solution

The fourth proportional to 427,551.40, 640,926.15 and 161,490.70 is: 242,084.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,551.40 : 640,926.15 = 161,490.70 : x
  2. Step 2: Convert to fraction form
    427,551.40/640,926.15 = 161,490.70/x
  3. Step 3: Cross multiply
    427,551.40x = 640,926.15 × 161,490.70
  4. Step 4: Simplify right side
    427,551.40x = 103,503,612,611.81
  5. Step 5: Solve for x
    x = 103,503,612,611.81/427,551.40
  6. Step 6: Final answer
    x = 242,084.61

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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.