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Finding the Fourth Proportional to 290,380.86, 435,555.78 and 90,678.39

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Solution

The fourth proportional to 290,380.86, 435,555.78 and 90,678.39 is: 136,012.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,380.86 : 435,555.78 = 90,678.39 : x
  2. Step 2: Convert to fraction form
    290,380.86/435,555.78 = 90,678.39/x
  3. Step 3: Cross multiply
    290,380.86x = 435,555.78 × 90,678.39
  4. Step 4: Simplify right side
    290,380.86x = 39,495,496,885.59
  5. Step 5: Solve for x
    x = 39,495,496,885.59/290,380.86
  6. Step 6: Final answer
    x = 136,012.74

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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.