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Finding the Fourth Proportional to 228,790.48, 315,729.96 and 128,188.24

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Solution

The fourth proportional to 228,790.48, 315,729.96 and 128,188.24 is: 176,899.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,790.48 : 315,729.96 = 128,188.24 : x
  2. Step 2: Convert to fraction form
    228,790.48/315,729.96 = 128,188.24/x
  3. Step 3: Cross multiply
    228,790.48x = 315,729.96 × 128,188.24
  4. Step 4: Simplify right side
    228,790.48x = 40,472,867,887.67
  5. Step 5: Solve for x
    x = 40,472,867,887.67/228,790.48
  6. Step 6: Final answer
    x = 176,899.27

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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.