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Finding the Fourth Proportional to 74,320.40, 111,480.60 and 18,916.40

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Solution

The fourth proportional to 74,320.40, 111,480.60 and 18,916.40 is: 28,374.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,320.40 : 111,480.60 = 18,916.40 : x
  2. Step 2: Convert to fraction form
    74,320.40/111,480.60 = 18,916.40/x
  3. Step 3: Cross multiply
    74,320.40x = 111,480.60 × 18,916.40
  4. Step 4: Simplify right side
    74,320.40x = 2,108,811,621.84
  5. Step 5: Solve for x
    x = 2,108,811,621.84/74,320.40
  6. Step 6: Final answer
    x = 28,374.60

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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.