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Finding the Fourth Proportional to 7,078.48, 9,780.62 and 5,818.57

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Solution

The fourth proportional to 7,078.48, 9,780.62 and 5,818.57 is: 8,039.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,078.48 : 9,780.62 = 5,818.57 : x
  2. Step 2: Convert to fraction form
    7,078.48/9,780.62 = 5,818.57/x
  3. Step 3: Cross multiply
    7,078.48x = 9,780.62 × 5,818.57
  4. Step 4: Simplify right side
    7,078.48x = 56,909,168.57
  5. Step 5: Solve for x
    x = 56,909,168.57/7,078.48
  6. Step 6: Final answer
    x = 8,039.75

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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.