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Finding the Fourth Proportional to 8,590.88, 12,873.36 and 6,389.28

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Solution

The fourth proportional to 8,590.88, 12,873.36 and 6,389.28 is: 9,574.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,590.88 : 12,873.36 = 6,389.28 : x
  2. Step 2: Convert to fraction form
    8,590.88/12,873.36 = 6,389.28/x
  3. Step 3: Cross multiply
    8,590.88x = 12,873.36 × 6,389.28
  4. Step 4: Simplify right side
    8,590.88x = 82,251,501.58
  5. Step 5: Solve for x
    x = 82,251,501.58/8,590.88
  6. Step 6: Final answer
    x = 9,574.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.