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Finding the Fourth Proportional to 393,122.88, 589,681.08 and 112,640.40

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Solution

The fourth proportional to 393,122.88, 589,681.08 and 112,640.40 is: 168,959.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,122.88 : 589,681.08 = 112,640.40 : x
  2. Step 2: Convert to fraction form
    393,122.88/589,681.08 = 112,640.40/x
  3. Step 3: Cross multiply
    393,122.88x = 589,681.08 × 112,640.40
  4. Step 4: Simplify right side
    393,122.88x = 66,421,912,723.63
  5. Step 5: Solve for x
    x = 66,421,912,723.63/393,122.88
  6. Step 6: Final answer
    x = 168,959.67

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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.