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Finding the Fourth Proportional to 85,762.90, 128,786.91 and 57,862.45

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Solution

The fourth proportional to 85,762.90, 128,786.91 and 57,862.45 is: 86,889.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,762.90 : 128,786.91 = 57,862.45 : x
  2. Step 2: Convert to fraction form
    85,762.90/128,786.91 = 57,862.45/x
  3. Step 3: Cross multiply
    85,762.90x = 128,786.91 × 57,862.45
  4. Step 4: Simplify right side
    85,762.90x = 7,451,926,140.53
  5. Step 5: Solve for x
    x = 7,451,926,140.53/85,762.90
  6. Step 6: Final answer
    x = 86,889.86

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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.