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Finding the Fourth Proportional to 287,991.40, 397,424.68 and 158,930.86

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Solution

The fourth proportional to 287,991.40, 397,424.68 and 158,930.86 is: 219,322.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,991.40 : 397,424.68 = 158,930.86 : x
  2. Step 2: Convert to fraction form
    287,991.40/397,424.68 = 158,930.86/x
  3. Step 3: Cross multiply
    287,991.40x = 397,424.68 × 158,930.86
  4. Step 4: Simplify right side
    287,991.40x = 63,163,046,177.62
  5. Step 5: Solve for x
    x = 63,163,046,177.62/287,991.40
  6. Step 6: Final answer
    x = 219,322.68

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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.