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Finding the Fourth Proportional to 65,720.40, 98,580.60 and 39,411.60

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Solution

The fourth proportional to 65,720.40, 98,580.60 and 39,411.60 is: 59,117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.40 : 98,580.60 = 39,411.60 : x
  2. Step 2: Convert to fraction form
    65,720.40/98,580.60 = 39,411.60/x
  3. Step 3: Cross multiply
    65,720.40x = 98,580.60 × 39,411.60
  4. Step 4: Simplify right side
    65,720.40x = 3,885,219,174.96
  5. Step 5: Solve for x
    x = 3,885,219,174.96/65,720.40
  6. Step 6: Final answer
    x = 59,117.40

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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.