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Finding the Fourth Proportional to 52,420.40, 78,663 and 21,255.92

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Solution

The fourth proportional to 52,420.40, 78,663 and 21,255.92 is: 31,897.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,420.40 : 78,663 = 21,255.92 : x
  2. Step 2: Convert to fraction form
    52,420.40/78,663 = 21,255.92/x
  3. Step 3: Cross multiply
    52,420.40x = 78,663 × 21,255.92
  4. Step 4: Simplify right side
    52,420.40x = 1,672,054,434.96
  5. Step 5: Solve for x
    x = 1,672,054,434.96/52,420.40
  6. Step 6: Final answer
    x = 31,897.02

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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.