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Finding the Fourth Proportional to 85,433.90, 128,280.45 and 65,734.70

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Solution

The fourth proportional to 85,433.90, 128,280.45 and 65,734.70 is: 98,701.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,433.90 : 128,280.45 = 65,734.70 : x
  2. Step 2: Convert to fraction form
    85,433.90/128,280.45 = 65,734.70/x
  3. Step 3: Cross multiply
    85,433.90x = 128,280.45 × 65,734.70
  4. Step 4: Simplify right side
    85,433.90x = 8,432,476,896.62
  5. Step 5: Solve for x
    x = 8,432,476,896.62/85,433.90
  6. Step 6: Final answer
    x = 98,701.77

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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.