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Finding the Fourth Proportional to 720,617.45, 994,434.59 and 398,319.26

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Solution

The fourth proportional to 720,617.45, 994,434.59 and 398,319.26 is: 549,670.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,617.45 : 994,434.59 = 398,319.26 : x
  2. Step 2: Convert to fraction form
    720,617.45/994,434.59 = 398,319.26/x
  3. Step 3: Cross multiply
    720,617.45x = 994,434.59 × 398,319.26
  4. Step 4: Simplify right side
    720,617.45x = 396,102,448,015.61
  5. Step 5: Solve for x
    x = 396,102,448,015.61/720,617.45
  6. Step 6: Final answer
    x = 549,670.91

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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.