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Finding the Fourth Proportional to 8,391.62, 12,570.15 and 4,920.50

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Solution

The fourth proportional to 8,391.62, 12,570.15 and 4,920.50 is: 7,370.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.62 : 12,570.15 = 4,920.50 : x
  2. Step 2: Convert to fraction form
    8,391.62/12,570.15 = 4,920.50/x
  3. Step 3: Cross multiply
    8,391.62x = 12,570.15 × 4,920.50
  4. Step 4: Simplify right side
    8,391.62x = 61,851,423.08
  5. Step 5: Solve for x
    x = 61,851,423.08/8,391.62
  6. Step 6: Final answer
    x = 7,370.62

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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.