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Finding the Fourth Proportional to 85,433.76, 128,173.68 and 77,208.48

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Solution

The fourth proportional to 85,433.76, 128,173.68 and 77,208.48 is: 115,833.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,433.76 : 128,173.68 = 77,208.48 : x
  2. Step 2: Convert to fraction form
    85,433.76/128,173.68 = 77,208.48/x
  3. Step 3: Cross multiply
    85,433.76x = 128,173.68 × 77,208.48
  4. Step 4: Simplify right side
    85,433.76x = 9,896,095,008.81
  5. Step 5: Solve for x
    x = 9,896,095,008.81/85,433.76
  6. Step 6: Final answer
    x = 115,833.54

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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.