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Finding the Fourth Proportional to 85,639.20, 128,401.20 and 45,664.80

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Solution

The fourth proportional to 85,639.20, 128,401.20 and 45,664.80 is: 68,466.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,639.20 : 128,401.20 = 45,664.80 : x
  2. Step 2: Convert to fraction form
    85,639.20/128,401.20 = 45,664.80/x
  3. Step 3: Cross multiply
    85,639.20x = 128,401.20 × 45,664.80
  4. Step 4: Simplify right side
    85,639.20x = 5,863,415,117.76
  5. Step 5: Solve for x
    x = 5,863,415,117.76/85,639.20
  6. Step 6: Final answer
    x = 68,466.49

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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.