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Finding the Fourth Proportional to 58,128, 87,204.96 and 21,192

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Solution

The fourth proportional to 58,128, 87,204.96 and 21,192 is: 31,792.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,128 : 87,204.96 = 21,192 : x
  2. Step 2: Convert to fraction form
    58,128/87,204.96 = 21,192/x
  3. Step 3: Cross multiply
    58,128x = 87,204.96 × 21,192
  4. Step 4: Simplify right side
    58,128x = 1,848,047,512.32
  5. Step 5: Solve for x
    x = 1,848,047,512.32/58,128
  6. Step 6: Final answer
    x = 31,792.72

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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.