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Finding the Fourth Proportional to 85,999.54, 128,665.59 and 75,389.77

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Solution

The fourth proportional to 85,999.54, 128,665.59 and 75,389.77 is: 112,792.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,999.54 : 128,665.59 = 75,389.77 : x
  2. Step 2: Convert to fraction form
    85,999.54/128,665.59 = 75,389.77/x
  3. Step 3: Cross multiply
    85,999.54x = 128,665.59 × 75,389.77
  4. Step 4: Simplify right side
    85,999.54x = 9,700,069,237.01
  5. Step 5: Solve for x
    x = 9,700,069,237.01/85,999.54
  6. Step 6: Final answer
    x = 112,792.11

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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.