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Finding the Fourth Proportional to 61,272.34, 91,779.35 and 28,020.40

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Solution

The fourth proportional to 61,272.34, 91,779.35 and 28,020.40 is: 41,971.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,272.34 : 91,779.35 = 28,020.40 : x
  2. Step 2: Convert to fraction form
    61,272.34/91,779.35 = 28,020.40/x
  3. Step 3: Cross multiply
    61,272.34x = 91,779.35 × 28,020.40
  4. Step 4: Simplify right side
    61,272.34x = 2,571,693,729.19
  5. Step 5: Solve for x
    x = 2,571,693,729.19/61,272.34
  6. Step 6: Final answer
    x = 41,971.53

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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.