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Finding the Fourth Proportional to 287,990.90, 397,424.00 and 158,930.36

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Solution

The fourth proportional to 287,990.90, 397,424.00 and 158,930.36 is: 219,321.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,990.90 : 397,424.00 = 158,930.36 : x
  2. Step 2: Convert to fraction form
    287,990.90/397,424.00 = 158,930.36/x
  3. Step 3: Cross multiply
    287,990.90x = 397,424.00 × 158,930.36
  4. Step 4: Simplify right side
    287,990.90x = 63,162,738,597.99
  5. Step 5: Solve for x
    x = 63,162,738,597.99/287,990.90
  6. Step 6: Final answer
    x = 219,321.99

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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.