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Finding the Fourth Proportional to 228,818.72, 315,754.80 and 128,197.28

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Solution

The fourth proportional to 228,818.72, 315,754.80 and 128,197.28 is: 176,903.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,818.72 : 315,754.80 = 128,197.28 : x
  2. Step 2: Convert to fraction form
    228,818.72/315,754.80 = 128,197.28/x
  3. Step 3: Cross multiply
    228,818.72x = 315,754.80 × 128,197.28
  4. Step 4: Simplify right side
    228,818.72x = 40,478,906,506.94
  5. Step 5: Solve for x
    x = 40,478,906,506.94/228,818.72
  6. Step 6: Final answer
    x = 176,903.82

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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.