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Finding the Fourth Proportional to 58,087.78, 87,139.74 and 18,656.98

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Solution

The fourth proportional to 58,087.78, 87,139.74 and 18,656.98 is: 27,988.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,087.78 : 87,139.74 = 18,656.98 : x
  2. Step 2: Convert to fraction form
    58,087.78/87,139.74 = 18,656.98/x
  3. Step 3: Cross multiply
    58,087.78x = 87,139.74 × 18,656.98
  4. Step 4: Simplify right side
    58,087.78x = 1,625,764,386.39
  5. Step 5: Solve for x
    x = 1,625,764,386.39/58,087.78
  6. Step 6: Final answer
    x = 27,988.06

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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.