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Finding the Fourth Proportional to 290,639.22, 435,963.18 and 191,434.74

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Solution

The fourth proportional to 290,639.22, 435,963.18 and 191,434.74 is: 287,154.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,639.22 : 435,963.18 = 191,434.74 : x
  2. Step 2: Convert to fraction form
    290,639.22/435,963.18 = 191,434.74/x
  3. Step 3: Cross multiply
    290,639.22x = 435,963.18 × 191,434.74
  4. Step 4: Simplify right side
    290,639.22x = 83,458,498,012.87
  5. Step 5: Solve for x
    x = 83,458,498,012.87/290,639.22
  6. Step 6: Final answer
    x = 287,154.98

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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.