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Finding the Fourth Proportional to 312,539.76, 431,336.76 and 225,396.36

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Solution

The fourth proportional to 312,539.76, 431,336.76 and 225,396.36 is: 311,069.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,539.76 : 431,336.76 = 225,396.36 : x
  2. Step 2: Convert to fraction form
    312,539.76/431,336.76 = 225,396.36/x
  3. Step 3: Cross multiply
    312,539.76x = 431,336.76 × 225,396.36
  4. Step 4: Simplify right side
    312,539.76x = 97,221,735,638.19
  5. Step 5: Solve for x
    x = 97,221,735,638.19/312,539.76
  6. Step 6: Final answer
    x = 311,069.98

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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.