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Finding the Fourth Proportional to 78,060.90, 117,054.84 and 28,134.42

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Solution

The fourth proportional to 78,060.90, 117,054.84 and 28,134.42 is: 42,188.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,060.90 : 117,054.84 = 28,134.42 : x
  2. Step 2: Convert to fraction form
    78,060.90/117,054.84 = 28,134.42/x
  3. Step 3: Cross multiply
    78,060.90x = 117,054.84 × 28,134.42
  4. Step 4: Simplify right side
    78,060.90x = 3,293,270,031.59
  5. Step 5: Solve for x
    x = 3,293,270,031.59/78,060.90
  6. Step 6: Final answer
    x = 42,188.47

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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.