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Finding the Fourth Proportional to 85,758.75, 128,717.10 and 43,668.92

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Solution

The fourth proportional to 85,758.75, 128,717.10 and 43,668.92 is: 65,543.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,758.75 : 128,717.10 = 43,668.92 : x
  2. Step 2: Convert to fraction form
    85,758.75/128,717.10 = 43,668.92/x
  3. Step 3: Cross multiply
    85,758.75x = 128,717.10 × 43,668.92
  4. Step 4: Simplify right side
    85,758.75x = 5,620,937,064.32
  5. Step 5: Solve for x
    x = 5,620,937,064.32/85,758.75
  6. Step 6: Final answer
    x = 65,543.60

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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.