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Finding the Fourth Proportional to 69,985.40, 104,978.10 and 25,613.60

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Solution

The fourth proportional to 69,985.40, 104,978.10 and 25,613.60 is: 38,420.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,985.40 : 104,978.10 = 25,613.60 : x
  2. Step 2: Convert to fraction form
    69,985.40/104,978.10 = 25,613.60/x
  3. Step 3: Cross multiply
    69,985.40x = 104,978.10 × 25,613.60
  4. Step 4: Simplify right side
    69,985.40x = 2,688,867,062.16
  5. Step 5: Solve for x
    x = 2,688,867,062.16/69,985.40
  6. Step 6: Final answer
    x = 38,420.40

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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.