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Finding the Fourth Proportional to 720,929.12, 994,871.80 and 398,632.12

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Solution

The fourth proportional to 720,929.12, 994,871.80 and 398,632.12 is: 550,106.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,929.12 : 994,871.80 = 398,632.12 : x
  2. Step 2: Convert to fraction form
    720,929.12/994,871.80 = 398,632.12/x
  3. Step 3: Cross multiply
    720,929.12x = 994,871.80 × 398,632.12
  4. Step 4: Simplify right side
    720,929.12x = 396,587,854,762.22
  5. Step 5: Solve for x
    x = 396,587,854,762.22/720,929.12
  6. Step 6: Final answer
    x = 550,106.58

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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.