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Finding the Fourth Proportional to 290,990.34, 436,503.93 and 91,318.59

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Solution

The fourth proportional to 290,990.34, 436,503.93 and 91,318.59 is: 136,983.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,990.34 : 436,503.93 = 91,318.59 : x
  2. Step 2: Convert to fraction form
    290,990.34/436,503.93 = 91,318.59/x
  3. Step 3: Cross multiply
    290,990.34x = 436,503.93 × 91,318.59
  4. Step 4: Simplify right side
    290,990.34x = 39,860,923,417.06
  5. Step 5: Solve for x
    x = 39,860,923,417.06/290,990.34
  6. Step 6: Final answer
    x = 136,983.67

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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.