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Finding the Fourth Proportional to 90,464, 124,840.32 and 55,136

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Solution

The fourth proportional to 90,464, 124,840.32 and 55,136 is: 76,087.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,464 : 124,840.32 = 55,136 : x
  2. Step 2: Convert to fraction form
    90,464/124,840.32 = 55,136/x
  3. Step 3: Cross multiply
    90,464x = 124,840.32 × 55,136
  4. Step 4: Simplify right side
    90,464x = 6,883,195,883.52
  5. Step 5: Solve for x
    x = 6,883,195,883.52/90,464
  6. Step 6: Final answer
    x = 76,087.68

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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.