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Finding the Fourth Proportional to 720,841.72, 994,721.40 and 398,533

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Solution

The fourth proportional to 720,841.72, 994,721.40 and 398,533 is: 549,953.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,841.72 : 994,721.40 = 398,533 : x
  2. Step 2: Convert to fraction form
    720,841.72/994,721.40 = 398,533/x
  3. Step 3: Cross multiply
    720,841.72x = 994,721.40 × 398,533
  4. Step 4: Simplify right side
    720,841.72x = 396,429,303,706.20
  5. Step 5: Solve for x
    x = 396,429,303,706.20/720,841.72
  6. Step 6: Final answer
    x = 549,953.33

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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.