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Finding the Fourth Proportional to 56,103.71, 84,130.92 and 21,018.76

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Solution

The fourth proportional to 56,103.71, 84,130.92 and 21,018.76 is: 31,518.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,103.71 : 84,130.92 = 21,018.76 : x
  2. Step 2: Convert to fraction form
    56,103.71/84,130.92 = 21,018.76/x
  3. Step 3: Cross multiply
    56,103.71x = 84,130.92 × 21,018.76
  4. Step 4: Simplify right side
    56,103.71x = 1,768,327,405.73
  5. Step 5: Solve for x
    x = 1,768,327,405.73/56,103.71
  6. Step 6: Final answer
    x = 31,518.91

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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.