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Finding the Fourth Proportional to 390,851.80, 586,277.70 and 342,640.60

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Solution

The fourth proportional to 390,851.80, 586,277.70 and 342,640.60 is: 513,960.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,851.80 : 586,277.70 = 342,640.60 : x
  2. Step 2: Convert to fraction form
    390,851.80/586,277.70 = 342,640.60/x
  3. Step 3: Cross multiply
    390,851.80x = 586,277.70 × 342,640.60
  4. Step 4: Simplify right side
    390,851.80x = 200,882,542,894.62
  5. Step 5: Solve for x
    x = 200,882,542,894.62/390,851.80
  6. Step 6: Final answer
    x = 513,960.90

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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.