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Finding the Fourth Proportional to 85,920.54, 128,889.51 and 29,760.54

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Solution

The fourth proportional to 85,920.54, 128,889.51 and 29,760.54 is: 44,643.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.54 : 128,889.51 = 29,760.54 : x
  2. Step 2: Convert to fraction form
    85,920.54/128,889.51 = 29,760.54/x
  3. Step 3: Cross multiply
    85,920.54x = 128,889.51 × 29,760.54
  4. Step 4: Simplify right side
    85,920.54x = 3,835,821,417.94
  5. Step 5: Solve for x
    x = 3,835,821,417.94/85,920.54
  6. Step 6: Final answer
    x = 44,643.82

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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.