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Finding the Fourth Proportional to 61,395.64, 92,108.79 and 21,415.21

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Solution

The fourth proportional to 61,395.64, 92,108.79 and 21,415.21 is: 32,128.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,395.64 : 92,108.79 = 21,415.21 : x
  2. Step 2: Convert to fraction form
    61,395.64/92,108.79 = 21,415.21/x
  3. Step 3: Cross multiply
    61,395.64x = 92,108.79 × 21,415.21
  4. Step 4: Simplify right side
    61,395.64x = 1,972,528,751.01
  5. Step 5: Solve for x
    x = 1,972,528,751.01/61,395.64
  6. Step 6: Final answer
    x = 32,128.16

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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.