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Finding the Fourth Proportional to 243,421.80, 365,132.70 and 85,828.20

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Solution

The fourth proportional to 243,421.80, 365,132.70 and 85,828.20 is: 128,742.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,421.80 : 365,132.70 = 85,828.20 : x
  2. Step 2: Convert to fraction form
    243,421.80/365,132.70 = 85,828.20/x
  3. Step 3: Cross multiply
    243,421.80x = 365,132.70 × 85,828.20
  4. Step 4: Simplify right side
    243,421.80x = 31,338,682,402.14
  5. Step 5: Solve for x
    x = 31,338,682,402.14/243,421.80
  6. Step 6: Final answer
    x = 128,742.30

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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.