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Finding the Fourth Proportional to 228,946.50, 315,946.17 and 128,344.50

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Solution

The fourth proportional to 228,946.50, 315,946.17 and 128,344.50 is: 177,115.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,946.50 : 315,946.17 = 128,344.50 : x
  2. Step 2: Convert to fraction form
    228,946.50/315,946.17 = 128,344.50/x
  3. Step 3: Cross multiply
    228,946.50x = 315,946.17 × 128,344.50
  4. Step 4: Simplify right side
    228,946.50x = 40,549,953,215.57
  5. Step 5: Solve for x
    x = 40,549,953,215.57/228,946.50
  6. Step 6: Final answer
    x = 177,115.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.