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Finding the Fourth Proportional to 81,290.75, 112,185.60 and 45,478.63

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Solution

The fourth proportional to 81,290.75, 112,185.60 and 45,478.63 is: 62,762.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,290.75 : 112,185.60 = 45,478.63 : x
  2. Step 2: Convert to fraction form
    81,290.75/112,185.60 = 45,478.63/x
  3. Step 3: Cross multiply
    81,290.75x = 112,185.60 × 45,478.63
  4. Step 4: Simplify right side
    81,290.75x = 5,102,047,113.26
  5. Step 5: Solve for x
    x = 5,102,047,113.26/81,290.75
  6. Step 6: Final answer
    x = 62,762.95

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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.