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Finding the Fourth Proportional to 61,974, 92,975.58 and 20,421

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Solution

The fourth proportional to 61,974, 92,975.58 and 20,421 is: 30,636.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,974 : 92,975.58 = 20,421 : x
  2. Step 2: Convert to fraction form
    61,974/92,975.58 = 20,421/x
  3. Step 3: Cross multiply
    61,974x = 92,975.58 × 20,421
  4. Step 4: Simplify right side
    61,974x = 1,898,654,319.18
  5. Step 5: Solve for x
    x = 1,898,654,319.18/61,974
  6. Step 6: Final answer
    x = 30,636.30

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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.