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Finding the Fourth Proportional to 290,406.78, 435,697.65 and 90,719.10

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Solution

The fourth proportional to 290,406.78, 435,697.65 and 90,719.10 is: 136,105.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,406.78 : 435,697.65 = 90,719.10 : x
  2. Step 2: Convert to fraction form
    290,406.78/435,697.65 = 90,719.10/x
  3. Step 3: Cross multiply
    290,406.78x = 435,697.65 × 90,719.10
  4. Step 4: Simplify right side
    290,406.78x = 39,526,098,680.12
  5. Step 5: Solve for x
    x = 39,526,098,680.12/290,406.78
  6. Step 6: Final answer
    x = 136,105.98

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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.