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Finding the Fourth Proportional to 65,776.51, 90,779.90 and 43,134.55

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Solution

The fourth proportional to 65,776.51, 90,779.90 and 43,134.55 is: 59,531.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,776.51 : 90,779.90 = 43,134.55 : x
  2. Step 2: Convert to fraction form
    65,776.51/90,779.90 = 43,134.55/x
  3. Step 3: Cross multiply
    65,776.51x = 90,779.90 × 43,134.55
  4. Step 4: Simplify right side
    65,776.51x = 3,915,749,919.87
  5. Step 5: Solve for x
    x = 3,915,749,919.87/65,776.51
  6. Step 6: Final answer
    x = 59,531.13

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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.