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Finding the Fourth Proportional to 85,716.96, 118,278 and 47,990.40

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Solution

The fourth proportional to 85,716.96, 118,278 and 47,990.40 is: 66,220.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,716.96 : 118,278 = 47,990.40 : x
  2. Step 2: Convert to fraction form
    85,716.96/118,278 = 47,990.40/x
  3. Step 3: Cross multiply
    85,716.96x = 118,278 × 47,990.40
  4. Step 4: Simplify right side
    85,716.96x = 5,676,208,531.20
  5. Step 5: Solve for x
    x = 5,676,208,531.20/85,716.96
  6. Step 6: Final answer
    x = 66,220.37

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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.