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Finding the Fourth Proportional to 7,578.61, 10,458.19 and 4,221.57

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Solution

The fourth proportional to 7,578.61, 10,458.19 and 4,221.57 is: 5,825.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,578.61 : 10,458.19 = 4,221.57 : x
  2. Step 2: Convert to fraction form
    7,578.61/10,458.19 = 4,221.57/x
  3. Step 3: Cross multiply
    7,578.61x = 10,458.19 × 4,221.57
  4. Step 4: Simplify right side
    7,578.61x = 44,149,981.16
  5. Step 5: Solve for x
    x = 44,149,981.16/7,578.61
  6. Step 6: Final answer
    x = 5,825.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.