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Finding the Fourth Proportional to 85,521.90, 128,412.45 and 65,822.70

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Solution

The fourth proportional to 85,521.90, 128,412.45 and 65,822.70 is: 98,833.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,521.90 : 128,412.45 = 65,822.70 : x
  2. Step 2: Convert to fraction form
    85,521.90/128,412.45 = 65,822.70/x
  3. Step 3: Cross multiply
    85,521.90x = 128,412.45 × 65,822.70
  4. Step 4: Simplify right side
    85,521.90x = 8,452,454,172.62
  5. Step 5: Solve for x
    x = 8,452,454,172.62/85,521.90
  6. Step 6: Final answer
    x = 98,833.80

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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.