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Finding the Fourth Proportional to 90,777.60, 136,166.40 and 85,708.80

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Solution

The fourth proportional to 90,777.60, 136,166.40 and 85,708.80 is: 128,563.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,777.60 : 136,166.40 = 85,708.80 : x
  2. Step 2: Convert to fraction form
    90,777.60/136,166.40 = 85,708.80/x
  3. Step 3: Cross multiply
    90,777.60x = 136,166.40 × 85,708.80
  4. Step 4: Simplify right side
    90,777.60x = 11,670,658,744.32
  5. Step 5: Solve for x
    x = 11,670,658,744.32/90,777.60
  6. Step 6: Final answer
    x = 128,563.20

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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.