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Finding the Fourth Proportional to 290,458.54, 435,688.14 and 90,779.97

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Solution

The fourth proportional to 290,458.54, 435,688.14 and 90,779.97 is: 136,170.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,458.54 : 435,688.14 = 90,779.97 : x
  2. Step 2: Convert to fraction form
    290,458.54/435,688.14 = 90,779.97/x
  3. Step 3: Cross multiply
    290,458.54x = 435,688.14 × 90,779.97
  4. Step 4: Simplify right side
    290,458.54x = 39,551,756,278.56
  5. Step 5: Solve for x
    x = 39,551,756,278.56/290,458.54
  6. Step 6: Final answer
    x = 136,170.06

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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.