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Finding the Fourth Proportional to 60,570, 90,855.40 and 21,126.96

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Solution

The fourth proportional to 60,570, 90,855.40 and 21,126.96 is: 31,690.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,570 : 90,855.40 = 21,126.96 : x
  2. Step 2: Convert to fraction form
    60,570/90,855.40 = 21,126.96/x
  3. Step 3: Cross multiply
    60,570x = 90,855.40 × 21,126.96
  4. Step 4: Simplify right side
    60,570x = 1,919,498,401.58
  5. Step 5: Solve for x
    x = 1,919,498,401.58/60,570
  6. Step 6: Final answer
    x = 31,690.58

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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.