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Finding the Fourth Proportional to 65,893.91, 90,929.90 and 39,038.99

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Solution

The fourth proportional to 65,893.91, 90,929.90 and 39,038.99 is: 53,871.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,893.91 : 90,929.90 = 39,038.99 : x
  2. Step 2: Convert to fraction form
    65,893.91/90,929.90 = 39,038.99/x
  3. Step 3: Cross multiply
    65,893.91x = 90,929.90 × 39,038.99
  4. Step 4: Simplify right side
    65,893.91x = 3,549,811,099.75
  5. Step 5: Solve for x
    x = 3,549,811,099.75/65,893.91
  6. Step 6: Final answer
    x = 53,871.62

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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.