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Finding the Fourth Proportional to 290,459.97, 435,059.01 and 140,385.56

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Solution

The fourth proportional to 290,459.97, 435,059.01 and 140,385.56 is: 210,273.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,459.97 : 435,059.01 = 140,385.56 : x
  2. Step 2: Convert to fraction form
    290,459.97/435,059.01 = 140,385.56/x
  3. Step 3: Cross multiply
    290,459.97x = 435,059.01 × 140,385.56
  4. Step 4: Simplify right side
    290,459.97x = 61,076,000,576.60
  5. Step 5: Solve for x
    x = 61,076,000,576.60/290,459.97
  6. Step 6: Final answer
    x = 210,273.38

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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.