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Finding the Fourth Proportional to 65,720.40, 98,580.60 and 46,021.20

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Solution

The fourth proportional to 65,720.40, 98,580.60 and 46,021.20 is: 69,031.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.40 : 98,580.60 = 46,021.20 : x
  2. Step 2: Convert to fraction form
    65,720.40/98,580.60 = 46,021.20/x
  3. Step 3: Cross multiply
    65,720.40x = 98,580.60 × 46,021.20
  4. Step 4: Simplify right side
    65,720.40x = 4,536,797,508.72
  5. Step 5: Solve for x
    x = 4,536,797,508.72/65,720.40
  6. Step 6: Final answer
    x = 69,031.80

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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.