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Finding the Fourth Proportional to 720,916.83, 994,937.84 and 398,651.31

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Solution

The fourth proportional to 720,916.83, 994,937.84 and 398,651.31 is: 550,178.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,916.83 : 994,937.84 = 398,651.31 : x
  2. Step 2: Convert to fraction form
    720,916.83/994,937.84 = 398,651.31/x
  3. Step 3: Cross multiply
    720,916.83x = 994,937.84 × 398,651.31
  4. Step 4: Simplify right side
    720,916.83x = 396,633,271,291.31
  5. Step 5: Solve for x
    x = 396,633,271,291.31/720,916.83
  6. Step 6: Final answer
    x = 550,178.96

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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.