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Finding the Fourth Proportional to 78,080.49, 117,120.34 and 18,916.17

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Solution

The fourth proportional to 78,080.49, 117,120.34 and 18,916.17 is: 28,374.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,080.49 : 117,120.34 = 18,916.17 : x
  2. Step 2: Convert to fraction form
    78,080.49/117,120.34 = 18,916.17/x
  3. Step 3: Cross multiply
    78,080.49x = 117,120.34 × 18,916.17
  4. Step 4: Simplify right side
    78,080.49x = 2,215,468,261.90
  5. Step 5: Solve for x
    x = 2,215,468,261.90/78,080.49
  6. Step 6: Final answer
    x = 28,374.16

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1.5x scale

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.