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Finding the Fourth Proportional to 85,409.40, 128,211.30 and 50,368.80

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Solution

The fourth proportional to 85,409.40, 128,211.30 and 50,368.80 is: 75,610.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,409.40 : 128,211.30 = 50,368.80 : x
  2. Step 2: Convert to fraction form
    85,409.40/128,211.30 = 50,368.80/x
  3. Step 3: Cross multiply
    85,409.40x = 128,211.30 × 50,368.80
  4. Step 4: Simplify right side
    85,409.40x = 6,457,849,327.44
  5. Step 5: Solve for x
    x = 6,457,849,327.44/85,409.40
  6. Step 6: Final answer
    x = 75,610.52

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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.