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Finding the Fourth Proportional to 720,397.12, 994,063.44 and 398,088

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Solution

The fourth proportional to 720,397.12, 994,063.44 and 398,088 is: 549,314.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,397.12 : 994,063.44 = 398,088 : x
  2. Step 2: Convert to fraction form
    720,397.12/994,063.44 = 398,088/x
  3. Step 3: Cross multiply
    720,397.12x = 994,063.44 × 398,088
  4. Step 4: Simplify right side
    720,397.12x = 395,724,726,702.72
  5. Step 5: Solve for x
    x = 395,724,726,702.72/720,397.12
  6. Step 6: Final answer
    x = 549,314.70

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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.