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Finding the Fourth Proportional to 65,889.48, 90,890.59 and 39,005.79

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Solution

The fourth proportional to 65,889.48, 90,890.59 and 39,005.79 is: 53,806.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,889.48 : 90,890.59 = 39,005.79 : x
  2. Step 2: Convert to fraction form
    65,889.48/90,890.59 = 39,005.79/x
  3. Step 3: Cross multiply
    65,889.48x = 90,890.59 × 39,005.79
  4. Step 4: Simplify right side
    65,889.48x = 3,545,259,266.52
  5. Step 5: Solve for x
    x = 3,545,259,266.52/65,889.48
  6. Step 6: Final answer
    x = 53,806.15

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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.