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Finding the Fourth Proportional to 90,321.60, 124,640.28 and 49,485

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Solution

The fourth proportional to 90,321.60, 124,640.28 and 49,485 is: 68,287.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,321.60 : 124,640.28 = 49,485 : x
  2. Step 2: Convert to fraction form
    90,321.60/124,640.28 = 49,485/x
  3. Step 3: Cross multiply
    90,321.60x = 124,640.28 × 49,485
  4. Step 4: Simplify right side
    90,321.60x = 6,167,824,255.80
  5. Step 5: Solve for x
    x = 6,167,824,255.80/90,321.60
  6. Step 6: Final answer
    x = 68,287.37

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1.5x scale

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.