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Finding the Fourth Proportional to 290,985.61, 436,496.86 and 91,313.87

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Solution

The fourth proportional to 290,985.61, 436,496.86 and 91,313.87 is: 136,976.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,985.61 : 436,496.86 = 91,313.87 : x
  2. Step 2: Convert to fraction form
    290,985.61/436,496.86 = 91,313.87/x
  3. Step 3: Cross multiply
    290,985.61x = 436,496.86 × 91,313.87
  4. Step 4: Simplify right side
    290,985.61x = 39,858,217,529.45
  5. Step 5: Solve for x
    x = 39,858,217,529.45/290,985.61
  6. Step 6: Final answer
    x = 136,976.59

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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.