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Finding the Fourth Proportional to 243,428.80, 365,143.20 and 85,835.20

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Solution

The fourth proportional to 243,428.80, 365,143.20 and 85,835.20 is: 128,752.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,428.80 : 365,143.20 = 85,835.20 : x
  2. Step 2: Convert to fraction form
    243,428.80/365,143.20 = 85,835.20/x
  3. Step 3: Cross multiply
    243,428.80x = 365,143.20 × 85,835.20
  4. Step 4: Simplify right side
    243,428.80x = 31,342,139,600.64
  5. Step 5: Solve for x
    x = 31,342,139,600.64/243,428.80
  6. Step 6: Final answer
    x = 128,752.80

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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.