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Finding the Fourth Proportional to 52,920.36, 79,360.53 and 21,319.71

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Solution

The fourth proportional to 52,920.36, 79,360.53 and 21,319.71 is: 31,971.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,920.36 : 79,360.53 = 21,319.71 : x
  2. Step 2: Convert to fraction form
    52,920.36/79,360.53 = 21,319.71/x
  3. Step 3: Cross multiply
    52,920.36x = 79,360.53 × 21,319.71
  4. Step 4: Simplify right side
    52,920.36x = 1,691,943,485.05
  5. Step 5: Solve for x
    x = 1,691,943,485.05/52,920.36
  6. Step 6: Final answer
    x = 31,971.50

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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.