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Finding the Fourth Proportional to 85,295.50, 128,054.12 and 65,587.90

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Solution

The fourth proportional to 85,295.50, 128,054.12 and 65,587.90 is: 98,467.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,295.50 : 128,054.12 = 65,587.90 : x
  2. Step 2: Convert to fraction form
    85,295.50/128,054.12 = 65,587.90/x
  3. Step 3: Cross multiply
    85,295.50x = 128,054.12 × 65,587.90
  4. Step 4: Simplify right side
    85,295.50x = 8,398,800,012.91
  5. Step 5: Solve for x
    x = 8,398,800,012.91/85,295.50
  6. Step 6: Final answer
    x = 98,467.09

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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.