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Finding the Fourth Proportional to 720,873.72, 994,761.54 and 398,564.46

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Solution

The fourth proportional to 720,873.72, 994,761.54 and 398,564.46 is: 549,994.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,873.72 : 994,761.54 = 398,564.46 : x
  2. Step 2: Convert to fraction form
    720,873.72/994,761.54 = 398,564.46/x
  3. Step 3: Cross multiply
    720,873.72x = 994,761.54 × 398,564.46
  4. Step 4: Simplify right side
    720,873.72x = 396,476,596,018.87
  5. Step 5: Solve for x
    x = 396,476,596,018.87/720,873.72
  6. Step 6: Final answer
    x = 549,994.52

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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.