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Finding the Fourth Proportional to 85,336.93, 128,018.76 and 69,503.86

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Solution

The fourth proportional to 85,336.93, 128,018.76 and 69,503.86 is: 104,266.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,336.93 : 128,018.76 = 69,503.86 : x
  2. Step 2: Convert to fraction form
    85,336.93/128,018.76 = 69,503.86/x
  3. Step 3: Cross multiply
    85,336.93x = 128,018.76 × 69,503.86
  4. Step 4: Simplify right side
    85,336.93x = 8,897,797,972.41
  5. Step 5: Solve for x
    x = 8,897,797,972.41/85,336.93
  6. Step 6: Final answer
    x = 104,266.68

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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.