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Finding the Fourth Proportional to 290,422.20, 407,005.80 and 290,422.20

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Solution

The fourth proportional to 290,422.20, 407,005.80 and 290,422.20 is: 407,005.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,422.20 : 407,005.80 = 290,422.20 : x
  2. Step 2: Convert to fraction form
    290,422.20/407,005.80 = 290,422.20/x
  3. Step 3: Cross multiply
    290,422.20x = 407,005.80 × 290,422.20
  4. Step 4: Simplify right side
    290,422.20x = 118,203,519,848.76
  5. Step 5: Solve for x
    x = 118,203,519,848.76/290,422.20
  6. Step 6: Final answer
    x = 407,005.80

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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.