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Finding the Fourth Proportional to 61,621.20, 92,431.80 and 20,072.40

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Solution

The fourth proportional to 61,621.20, 92,431.80 and 20,072.40 is: 30,108.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,621.20 : 92,431.80 = 20,072.40 : x
  2. Step 2: Convert to fraction form
    61,621.20/92,431.80 = 20,072.40/x
  3. Step 3: Cross multiply
    61,621.20x = 92,431.80 × 20,072.40
  4. Step 4: Simplify right side
    61,621.20x = 1,855,328,062.32
  5. Step 5: Solve for x
    x = 1,855,328,062.32/61,621.20
  6. Step 6: Final answer
    x = 30,108.60

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1.5x scale

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.