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Finding the Fourth Proportional to 90,565.79, 135,903.95 and 57,239.96

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Solution

The fourth proportional to 90,565.79, 135,903.95 and 57,239.96 is: 85,894.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,565.79 : 135,903.95 = 57,239.96 : x
  2. Step 2: Convert to fraction form
    90,565.79/135,903.95 = 57,239.96/x
  3. Step 3: Cross multiply
    90,565.79x = 135,903.95 × 57,239.96
  4. Step 4: Simplify right side
    90,565.79x = 7,779,135,696.12
  5. Step 5: Solve for x
    x = 7,779,135,696.12/90,565.79
  6. Step 6: Final answer
    x = 85,894.86

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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.