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Finding the Fourth Proportional to 85,720.84, 118,215.42 and 58,815.88

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Solution

The fourth proportional to 85,720.84, 118,215.42 and 58,815.88 is: 81,111.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,720.84 : 118,215.42 = 58,815.88 : x
  2. Step 2: Convert to fraction form
    85,720.84/118,215.42 = 58,815.88/x
  3. Step 3: Cross multiply
    85,720.84x = 118,215.42 × 58,815.88
  4. Step 4: Simplify right side
    85,720.84x = 6,952,943,956.87
  5. Step 5: Solve for x
    x = 6,952,943,956.87/85,720.84
  6. Step 6: Final answer
    x = 81,111.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.