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Finding the Fourth Proportional to 720,786.72, 994,666.23 and 398,510.40

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Solution

The fourth proportional to 720,786.72, 994,666.23 and 398,510.40 is: 549,933.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,786.72 : 994,666.23 = 398,510.40 : x
  2. Step 2: Convert to fraction form
    720,786.72/994,666.23 = 398,510.40/x
  3. Step 3: Cross multiply
    720,786.72x = 994,666.23 × 398,510.40
  4. Step 4: Simplify right side
    720,786.72x = 396,384,837,183.79
  5. Step 5: Solve for x
    x = 396,384,837,183.79/720,786.72
  6. Step 6: Final answer
    x = 549,933.60

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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.