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Finding the Fourth Proportional to 85,705.88, 118,274.11 and 47,980.40

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Solution

The fourth proportional to 85,705.88, 118,274.11 and 47,980.40 is: 66,212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,705.88 : 118,274.11 = 47,980.40 : x
  2. Step 2: Convert to fraction form
    85,705.88/118,274.11 = 47,980.40/x
  3. Step 3: Cross multiply
    85,705.88x = 118,274.11 × 47,980.40
  4. Step 4: Simplify right side
    85,705.88x = 5,674,838,396.12
  5. Step 5: Solve for x
    x = 5,674,838,396.12/85,705.88
  6. Step 6: Final answer
    x = 66,212.95

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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.