Home / 8,678.72-11,977.80-5,320.86

Finding the Fourth Proportional to 8,678.72, 11,977.80 and 5,320.86

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Solution

The fourth proportional to 8,678.72, 11,977.80 and 5,320.86 is: 7,343.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678.72 : 11,977.80 = 5,320.86 : x
  2. Step 2: Convert to fraction form
    8,678.72/11,977.80 = 5,320.86/x
  3. Step 3: Cross multiply
    8,678.72x = 11,977.80 × 5,320.86
  4. Step 4: Simplify right side
    8,678.72x = 63,732,196.91
  5. Step 5: Solve for x
    x = 63,732,196.91/8,678.72
  6. Step 6: Final answer
    x = 7,343.50

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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.