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Finding the Fourth Proportional to 128,495.06, 192,531.92 and 90,987.80

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Solution

The fourth proportional to 128,495.06, 192,531.92 and 90,987.80 is: 136,332.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,495.06 : 192,531.92 = 90,987.80 : x
  2. Step 2: Convert to fraction form
    128,495.06/192,531.92 = 90,987.80/x
  3. Step 3: Cross multiply
    128,495.06x = 192,531.92 × 90,987.80
  4. Step 4: Simplify right side
    128,495.06x = 17,518,056,027.57
  5. Step 5: Solve for x
    x = 17,518,056,027.57/128,495.06
  6. Step 6: Final answer
    x = 136,332.52

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1.5x scale

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.