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Finding the Fourth Proportional to 85,531.80, 128,297.70 and 50,539.80

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Solution

The fourth proportional to 85,531.80, 128,297.70 and 50,539.80 is: 75,809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,531.80 : 128,297.70 = 50,539.80 : x
  2. Step 2: Convert to fraction form
    85,531.80/128,297.70 = 50,539.80/x
  3. Step 3: Cross multiply
    85,531.80x = 128,297.70 × 50,539.80
  4. Step 4: Simplify right side
    85,531.80x = 6,484,140,098.46
  5. Step 5: Solve for x
    x = 6,484,140,098.46/85,531.80
  6. Step 6: Final answer
    x = 75,809.70

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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.