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Finding the Fourth Proportional to 291,402.30, 436,992.74 and 139,443.40

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Solution

The fourth proportional to 291,402.30, 436,992.74 and 139,443.40 is: 209,112.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,402.30 : 436,992.74 = 139,443.40 : x
  2. Step 2: Convert to fraction form
    291,402.30/436,992.74 = 139,443.40/x
  3. Step 3: Cross multiply
    291,402.30x = 436,992.74 × 139,443.40
  4. Step 4: Simplify right side
    291,402.30x = 60,935,753,812.85
  5. Step 5: Solve for x
    x = 60,935,753,812.85/291,402.30
  6. Step 6: Final answer
    x = 209,112.12

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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.