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Finding the Fourth Proportional to 707,515.20, 976,219.29 and 420,979.32

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Solution

The fourth proportional to 707,515.20, 976,219.29 and 420,979.32 is: 580,861.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    707,515.20 : 976,219.29 = 420,979.32 : x
  2. Step 2: Convert to fraction form
    707,515.20/976,219.29 = 420,979.32/x
  3. Step 3: Cross multiply
    707,515.20x = 976,219.29 × 420,979.32
  4. Step 4: Simplify right side
    707,515.20x = 410,968,132,875.08
  5. Step 5: Solve for x
    x = 410,968,132,875.08/707,515.20
  6. Step 6: Final answer
    x = 580,861.21

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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.