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Finding the Fourth Proportional to 420,430.63, 580,207.83 and 239,137.89

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Solution

The fourth proportional to 420,430.63, 580,207.83 and 239,137.89 is: 330,018.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,430.63 : 580,207.83 = 239,137.89 : x
  2. Step 2: Convert to fraction form
    420,430.63/580,207.83 = 239,137.89/x
  3. Step 3: Cross multiply
    420,430.63x = 580,207.83 × 239,137.89
  4. Step 4: Simplify right side
    420,430.63x = 138,749,680,068.37
  5. Step 5: Solve for x
    x = 138,749,680,068.37/420,430.63
  6. Step 6: Final answer
    x = 330,018.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.