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Finding the Fourth Proportional to 112,643.80, 155,261.82 and 80,762.20

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Solution

The fourth proportional to 112,643.80, 155,261.82 and 80,762.20 is: 111,318.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,643.80 : 155,261.82 = 80,762.20 : x
  2. Step 2: Convert to fraction form
    112,643.80/155,261.82 = 80,762.20/x
  3. Step 3: Cross multiply
    112,643.80x = 155,261.82 × 80,762.20
  4. Step 4: Simplify right side
    112,643.80x = 12,539,286,159.20
  5. Step 5: Solve for x
    x = 12,539,286,159.20/112,643.80
  6. Step 6: Final answer
    x = 111,318.03

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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.