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Finding the Fourth Proportional to 85,664.79, 128,401.61 and 35,728.29

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Solution

The fourth proportional to 85,664.79, 128,401.61 and 35,728.29 is: 53,552.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,664.79 : 128,401.61 = 35,728.29 : x
  2. Step 2: Convert to fraction form
    85,664.79/128,401.61 = 35,728.29/x
  3. Step 3: Cross multiply
    85,664.79x = 128,401.61 × 35,728.29
  4. Step 4: Simplify right side
    85,664.79x = 4,587,569,779.91
  5. Step 5: Solve for x
    x = 4,587,569,779.91/85,664.79
  6. Step 6: Final answer
    x = 53,552.57

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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.