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Finding the Fourth Proportional to 228,712.13, 315,622.76 and 139,288.13

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Solution

The fourth proportional to 228,712.13, 315,622.76 and 139,288.13 is: 192,217.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,712.13 : 315,622.76 = 139,288.13 : x
  2. Step 2: Convert to fraction form
    228,712.13/315,622.76 = 139,288.13/x
  3. Step 3: Cross multiply
    228,712.13x = 315,622.76 × 139,288.13
  4. Step 4: Simplify right side
    228,712.13x = 43,962,501,751.28
  5. Step 5: Solve for x
    x = 43,962,501,751.28/228,712.13
  6. Step 6: Final answer
    x = 192,217.63

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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.