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Finding the Fourth Proportional to 52,590.72, 78,917.28 and 21,015.68

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Solution

The fourth proportional to 52,590.72, 78,917.28 and 21,015.68 is: 31,535.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,590.72 : 78,917.28 = 21,015.68 : x
  2. Step 2: Convert to fraction form
    52,590.72/78,917.28 = 21,015.68/x
  3. Step 3: Cross multiply
    52,590.72x = 78,917.28 × 21,015.68
  4. Step 4: Simplify right side
    52,590.72x = 1,658,499,908.36
  5. Step 5: Solve for x
    x = 1,658,499,908.36/52,590.72
  6. Step 6: Final answer
    x = 31,535.98

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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.