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Finding the Fourth Proportional to 290,658.80, 405,989.20 and 290,658.80

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Solution

The fourth proportional to 290,658.80, 405,989.20 and 290,658.80 is: 405,989.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,658.80 : 405,989.20 = 290,658.80 : x
  2. Step 2: Convert to fraction form
    290,658.80/405,989.20 = 290,658.80/x
  3. Step 3: Cross multiply
    290,658.80x = 405,989.20 × 290,658.80
  4. Step 4: Simplify right side
    290,658.80x = 118,004,333,684.96
  5. Step 5: Solve for x
    x = 118,004,333,684.96/290,658.80
  6. Step 6: Final answer
    x = 405,989.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.