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Finding the Fourth Proportional to 228,121.20, 342,149.40 and 78,368.40

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Solution

The fourth proportional to 228,121.20, 342,149.40 and 78,368.40 is: 117,541.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,121.20 : 342,149.40 = 78,368.40 : x
  2. Step 2: Convert to fraction form
    228,121.20/342,149.40 = 78,368.40/x
  3. Step 3: Cross multiply
    228,121.20x = 342,149.40 × 78,368.40
  4. Step 4: Simplify right side
    228,121.20x = 26,813,701,038.96
  5. Step 5: Solve for x
    x = 26,813,701,038.96/228,121.20
  6. Step 6: Final answer
    x = 117,541.47

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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.