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Finding the Fourth Proportional to 56,486.70, 84,730.05 and 21,421.80

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Solution

The fourth proportional to 56,486.70, 84,730.05 and 21,421.80 is: 32,132.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,486.70 : 84,730.05 = 21,421.80 : x
  2. Step 2: Convert to fraction form
    56,486.70/84,730.05 = 21,421.80/x
  3. Step 3: Cross multiply
    56,486.70x = 84,730.05 × 21,421.80
  4. Step 4: Simplify right side
    56,486.70x = 1,815,070,185.09
  5. Step 5: Solve for x
    x = 1,815,070,185.09/56,486.70
  6. Step 6: Final answer
    x = 32,132.70

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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.