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Finding the Fourth Proportional to 53,712.60, 80,544.60 and 20,421.60

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Solution

The fourth proportional to 53,712.60, 80,544.60 and 20,421.60 is: 30,623.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,712.60 : 80,544.60 = 20,421.60 : x
  2. Step 2: Convert to fraction form
    53,712.60/80,544.60 = 20,421.60/x
  3. Step 3: Cross multiply
    53,712.60x = 80,544.60 × 20,421.60
  4. Step 4: Simplify right side
    53,712.60x = 1,644,849,603.36
  5. Step 5: Solve for x
    x = 1,644,849,603.36/53,712.60
  6. Step 6: Final answer
    x = 30,623.16

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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.