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Finding the Fourth Proportional to 290,387.30, 435,565.28 and 90,684.77

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Solution

The fourth proportional to 290,387.30, 435,565.28 and 90,684.77 is: 136,022.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,387.30 : 435,565.28 = 90,684.77 : x
  2. Step 2: Convert to fraction form
    290,387.30/435,565.28 = 90,684.77/x
  3. Step 3: Cross multiply
    290,387.30x = 435,565.28 × 90,684.77
  4. Step 4: Simplify right side
    290,387.30x = 39,499,135,285.67
  5. Step 5: Solve for x
    x = 39,499,135,285.67/290,387.30
  6. Step 6: Final answer
    x = 136,022.26

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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.