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Finding the Fourth Proportional to 6,390.47, 8,818.22 and 4,712.78

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Solution

The fourth proportional to 6,390.47, 8,818.22 and 4,712.78 is: 6,503.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.47 : 8,818.22 = 4,712.78 : x
  2. Step 2: Convert to fraction form
    6,390.47/8,818.22 = 4,712.78/x
  3. Step 3: Cross multiply
    6,390.47x = 8,818.22 × 4,712.78
  4. Step 4: Simplify right side
    6,390.47x = 41,558,364.68
  5. Step 5: Solve for x
    x = 41,558,364.68/6,390.47
  6. Step 6: Final answer
    x = 6,503.18

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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.