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Finding the Fourth Proportional to 85,839.15, 128,813.40 and 50,300.40

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Solution

The fourth proportional to 85,839.15, 128,813.40 and 50,300.40 is: 75,482.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839.15 : 128,813.40 = 50,300.40 : x
  2. Step 2: Convert to fraction form
    85,839.15/128,813.40 = 50,300.40/x
  3. Step 3: Cross multiply
    85,839.15x = 128,813.40 × 50,300.40
  4. Step 4: Simplify right side
    85,839.15x = 6,479,365,545.36
  5. Step 5: Solve for x
    x = 6,479,365,545.36/85,839.15
  6. Step 6: Final answer
    x = 75,482.64

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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.