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Finding the Fourth Proportional to 228,917.88, 315,905.67 and 128,315.88

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Solution

The fourth proportional to 228,917.88, 315,905.67 and 128,315.88 is: 177,075.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,917.88 : 315,905.67 = 128,315.88 : x
  2. Step 2: Convert to fraction form
    228,917.88/315,905.67 = 128,315.88/x
  3. Step 3: Cross multiply
    228,917.88x = 315,905.67 × 128,315.88
  4. Step 4: Simplify right side
    228,917.88x = 40,535,714,043.04
  5. Step 5: Solve for x
    x = 40,535,714,043.04/228,917.88
  6. Step 6: Final answer
    x = 177,075.35

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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.