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Finding the Fourth Proportional to 61,982, 92,987.58 and 20,429

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Solution

The fourth proportional to 61,982, 92,987.58 and 20,429 is: 30,648.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,982 : 92,987.58 = 20,429 : x
  2. Step 2: Convert to fraction form
    61,982/92,987.58 = 20,429/x
  3. Step 3: Cross multiply
    61,982x = 92,987.58 × 20,429
  4. Step 4: Simplify right side
    61,982x = 1,899,643,271.82
  5. Step 5: Solve for x
    x = 1,899,643,271.82/61,982
  6. Step 6: Final answer
    x = 30,648.31

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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.