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Finding the Fourth Proportional to 456,078.80, 683,081.40 and 288,117.20

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Solution

The fourth proportional to 456,078.80, 683,081.40 and 288,117.20 is: 431,520.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    456,078.80 : 683,081.40 = 288,117.20 : x
  2. Step 2: Convert to fraction form
    456,078.80/683,081.40 = 288,117.20/x
  3. Step 3: Cross multiply
    456,078.80x = 683,081.40 × 288,117.20
  4. Step 4: Simplify right side
    456,078.80x = 196,807,500,340.08
  5. Step 5: Solve for x
    x = 196,807,500,340.08/456,078.80
  6. Step 6: Final answer
    x = 431,520.83

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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.