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Finding the Fourth Proportional to 82,899.90, 124,349.85 and 20,570.40

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Solution

The fourth proportional to 82,899.90, 124,349.85 and 20,570.40 is: 30,855.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,899.90 : 124,349.85 = 20,570.40 : x
  2. Step 2: Convert to fraction form
    82,899.90/124,349.85 = 20,570.40/x
  3. Step 3: Cross multiply
    82,899.90x = 124,349.85 × 20,570.40
  4. Step 4: Simplify right side
    82,899.90x = 2,557,926,154.44
  5. Step 5: Solve for x
    x = 2,557,926,154.44/82,899.90
  6. Step 6: Final answer
    x = 30,855.60

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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.