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Finding the Fourth Proportional to 230,364.90, 317,929.28 and 128,399.67

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Solution

The fourth proportional to 230,364.90, 317,929.28 and 128,399.67 is: 177,205.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,364.90 : 317,929.28 = 128,399.67 : x
  2. Step 2: Convert to fraction form
    230,364.90/317,929.28 = 128,399.67/x
  3. Step 3: Cross multiply
    230,364.90x = 317,929.28 × 128,399.67
  4. Step 4: Simplify right side
    230,364.90x = 40,822,013,993.34
  5. Step 5: Solve for x
    x = 40,822,013,993.34/230,364.90
  6. Step 6: Final answer
    x = 177,205.88

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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.