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Finding the Fourth Proportional to 239,678.90, 359,491.78 and 85,798.79

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Solution

The fourth proportional to 239,678.90, 359,491.78 and 85,798.79 is: 128,688.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,678.90 : 359,491.78 = 85,798.79 : x
  2. Step 2: Convert to fraction form
    239,678.90/359,491.78 = 85,798.79/x
  3. Step 3: Cross multiply
    239,678.90x = 359,491.78 × 85,798.79
  4. Step 4: Simplify right side
    239,678.90x = 30,843,959,738.95
  5. Step 5: Solve for x
    x = 30,843,959,738.95/239,678.90
  6. Step 6: Final answer
    x = 128,688.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.