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Finding the Fourth Proportional to 720,748.50, 994,590.22 and 398,439.37

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Solution

The fourth proportional to 720,748.50, 994,590.22 and 398,439.37 is: 549,822.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,748.50 : 994,590.22 = 398,439.37 : x
  2. Step 2: Convert to fraction form
    720,748.50/994,590.22 = 398,439.37/x
  3. Step 3: Cross multiply
    720,748.50x = 994,590.22 × 398,439.37
  4. Step 4: Simplify right side
    720,748.50x = 396,283,900,664.96
  5. Step 5: Solve for x
    x = 396,283,900,664.96/720,748.50
  6. Step 6: Final answer
    x = 549,822.72

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1.5x scale

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.