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Finding the Fourth Proportional to 213,581.01, 320,272.89 and 78,611.17

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Solution

The fourth proportional to 213,581.01, 320,272.89 and 78,611.17 is: 117,880.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,581.01 : 320,272.89 = 78,611.17 : x
  2. Step 2: Convert to fraction form
    213,581.01/320,272.89 = 78,611.17/x
  3. Step 3: Cross multiply
    213,581.01x = 320,272.89 × 78,611.17
  4. Step 4: Simplify right side
    213,581.01x = 25,177,026,602.18
  5. Step 5: Solve for x
    x = 25,177,026,602.18/213,581.01
  6. Step 6: Final answer
    x = 117,880.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.