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Finding the Fourth Proportional to 5,678.78, 7,836.78 and 3,320.46

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Solution

The fourth proportional to 5,678.78, 7,836.78 and 3,320.46 is: 4,582.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,678.78 : 7,836.78 = 3,320.46 : x
  2. Step 2: Convert to fraction form
    5,678.78/7,836.78 = 3,320.46/x
  3. Step 3: Cross multiply
    5,678.78x = 7,836.78 × 3,320.46
  4. Step 4: Simplify right side
    5,678.78x = 26,021,714.52
  5. Step 5: Solve for x
    x = 26,021,714.52/5,678.78
  6. Step 6: Final answer
    x = 4,582.27

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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.