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Finding the Fourth Proportional to 720,368.08, 994,081.20 and 398,071.48

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Solution

The fourth proportional to 720,368.08, 994,081.20 and 398,071.48 is: 549,323.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,368.08 : 994,081.20 = 398,071.48 : x
  2. Step 2: Convert to fraction form
    720,368.08/994,081.20 = 398,071.48/x
  3. Step 3: Cross multiply
    720,368.08x = 994,081.20 × 398,071.48
  4. Step 4: Simplify right side
    720,368.08x = 395,715,374,524.18
  5. Step 5: Solve for x
    x = 395,715,374,524.18/720,368.08
  6. Step 6: Final answer
    x = 549,323.86

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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.