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Finding the Fourth Proportional to 290,638.56, 435,799.76 and 90,872.80

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Solution

The fourth proportional to 290,638.56, 435,799.76 and 90,872.80 is: 136,259.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,638.56 : 435,799.76 = 90,872.80 : x
  2. Step 2: Convert to fraction form
    290,638.56/435,799.76 = 90,872.80/x
  3. Step 3: Cross multiply
    290,638.56x = 435,799.76 × 90,872.80
  4. Step 4: Simplify right side
    290,638.56x = 39,602,344,430.53
  5. Step 5: Solve for x
    x = 39,602,344,430.53/290,638.56
  6. Step 6: Final answer
    x = 136,259.77

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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.