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Finding the Fourth Proportional to 78,294.90, 117,398.34 and 25,699.98

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Solution

The fourth proportional to 78,294.90, 117,398.34 and 25,699.98 is: 38,535.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,294.90 : 117,398.34 = 25,699.98 : x
  2. Step 2: Convert to fraction form
    78,294.90/117,398.34 = 25,699.98/x
  3. Step 3: Cross multiply
    78,294.90x = 117,398.34 × 25,699.98
  4. Step 4: Simplify right side
    78,294.90x = 3,017,134,990.03
  5. Step 5: Solve for x
    x = 3,017,134,990.03/78,294.90
  6. Step 6: Final answer
    x = 38,535.52

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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.