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Finding the Fourth Proportional to 64,889.40, 97,139.70 and 38,580.60

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Solution

The fourth proportional to 64,889.40, 97,139.70 and 38,580.60 is: 57,755.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,889.40 : 97,139.70 = 38,580.60 : x
  2. Step 2: Convert to fraction form
    64,889.40/97,139.70 = 38,580.60/x
  3. Step 3: Cross multiply
    64,889.40x = 97,139.70 × 38,580.60
  4. Step 4: Simplify right side
    64,889.40x = 3,747,707,909.82
  5. Step 5: Solve for x
    x = 3,747,707,909.82/64,889.40
  6. Step 6: Final answer
    x = 57,755.32

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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.