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Finding the Fourth Proportional to 251,640, 377,518.32 and 85,428

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Solution

The fourth proportional to 251,640, 377,518.32 and 85,428 is: 128,161.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,640 : 377,518.32 = 85,428 : x
  2. Step 2: Convert to fraction form
    251,640/377,518.32 = 85,428/x
  3. Step 3: Cross multiply
    251,640x = 377,518.32 × 85,428
  4. Step 4: Simplify right side
    251,640x = 32,250,635,040.96
  5. Step 5: Solve for x
    x = 32,250,635,040.96/251,640
  6. Step 6: Final answer
    x = 128,161.80

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.