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Finding the Fourth Proportional to 219,015.70, 328,280.55 and 85,851.70

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Solution

The fourth proportional to 219,015.70, 328,280.55 and 85,851.70 is: 128,682.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,015.70 : 328,280.55 = 85,851.70 : x
  2. Step 2: Convert to fraction form
    219,015.70/328,280.55 = 85,851.70/x
  3. Step 3: Cross multiply
    219,015.70x = 328,280.55 × 85,851.70
  4. Step 4: Simplify right side
    219,015.70x = 28,183,443,294.44
  5. Step 5: Solve for x
    x = 28,183,443,294.44/219,015.70
  6. Step 6: Final answer
    x = 128,682.30

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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.