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Finding the Fourth Proportional to 120,445.45, 180,471.08 and 72,916.48

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Solution

The fourth proportional to 120,445.45, 180,471.08 and 72,916.48 is: 109,255.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,445.45 : 180,471.08 = 72,916.48 : x
  2. Step 2: Convert to fraction form
    120,445.45/180,471.08 = 72,916.48/x
  3. Step 3: Cross multiply
    120,445.45x = 180,471.08 × 72,916.48
  4. Step 4: Simplify right side
    120,445.45x = 13,159,316,098.20
  5. Step 5: Solve for x
    x = 13,159,316,098.20/120,445.45
  6. Step 6: Final answer
    x = 109,255.40

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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.