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Finding the Fourth Proportional to 290,143.80, 435,215.70 and 90,462.60

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Solution

The fourth proportional to 290,143.80, 435,215.70 and 90,462.60 is: 135,693.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,143.80 : 435,215.70 = 90,462.60 : x
  2. Step 2: Convert to fraction form
    290,143.80/435,215.70 = 90,462.60/x
  3. Step 3: Cross multiply
    290,143.80x = 435,215.70 × 90,462.60
  4. Step 4: Simplify right side
    290,143.80x = 39,370,743,782.82
  5. Step 5: Solve for x
    x = 39,370,743,782.82/290,143.80
  6. Step 6: Final answer
    x = 135,693.90

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1.5x scale

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.