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Finding the Fourth Proportional to 65,307.94, 90,134.81 and 39,829.09

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Solution

The fourth proportional to 65,307.94, 90,134.81 and 39,829.09 is: 54,970.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,307.94 : 90,134.81 = 39,829.09 : x
  2. Step 2: Convert to fraction form
    65,307.94/90,134.81 = 39,829.09/x
  3. Step 3: Cross multiply
    65,307.94x = 90,134.81 × 39,829.09
  4. Step 4: Simplify right side
    65,307.94x = 3,589,987,459.62
  5. Step 5: Solve for x
    x = 3,589,987,459.62/65,307.94
  6. Step 6: Final answer
    x = 54,970.15

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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.