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Finding the Fourth Proportional to 65,685.75, 90,646.70 and 35,877.75

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Solution

The fourth proportional to 65,685.75, 90,646.70 and 35,877.75 is: 49,511.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,685.75 : 90,646.70 = 35,877.75 : x
  2. Step 2: Convert to fraction form
    65,685.75/90,646.70 = 35,877.75/x
  3. Step 3: Cross multiply
    65,685.75x = 90,646.70 × 35,877.75
  4. Step 4: Simplify right side
    65,685.75x = 3,252,199,461.54
  5. Step 5: Solve for x
    x = 3,252,199,461.54/65,685.75
  6. Step 6: Final answer
    x = 49,511.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.