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Finding the Fourth Proportional to 720,618.77, 994,411.16 and 398,309.65

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Solution

The fourth proportional to 720,618.77, 994,411.16 and 398,309.65 is: 549,643.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,618.77 : 994,411.16 = 398,309.65 : x
  2. Step 2: Convert to fraction form
    720,618.77/994,411.16 = 398,309.65/x
  3. Step 3: Cross multiply
    720,618.77x = 994,411.16 × 398,309.65
  4. Step 4: Simplify right side
    720,618.77x = 396,083,556,618.12
  5. Step 5: Solve for x
    x = 396,083,556,618.12/720,618.77
  6. Step 6: Final answer
    x = 549,643.68

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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.