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Finding the Fourth Proportional to 14,686.78, 20,267.40 and 8,398.78

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Solution

The fourth proportional to 14,686.78, 20,267.40 and 8,398.78 is: 11,590.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,686.78 : 20,267.40 = 8,398.78 : x
  2. Step 2: Convert to fraction form
    14,686.78/20,267.40 = 8,398.78/x
  3. Step 3: Cross multiply
    14,686.78x = 20,267.40 × 8,398.78
  4. Step 4: Simplify right side
    14,686.78x = 170,221,433.77
  5. Step 5: Solve for x
    x = 170,221,433.77/14,686.78
  6. Step 6: Final answer
    x = 11,590.11

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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.