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Finding the Fourth Proportional to 78,492.60, 117,738.98 and 28,573.11

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Solution

The fourth proportional to 78,492.60, 117,738.98 and 28,573.11 is: 42,859.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,492.60 : 117,738.98 = 28,573.11 : x
  2. Step 2: Convert to fraction form
    78,492.60/117,738.98 = 28,573.11/x
  3. Step 3: Cross multiply
    78,492.60x = 117,738.98 × 28,573.11
  4. Step 4: Simplify right side
    78,492.60x = 3,364,168,095.27
  5. Step 5: Solve for x
    x = 3,364,168,095.27/78,492.60
  6. Step 6: Final answer
    x = 42,859.69

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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.