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Finding the Fourth Proportional to 720,626.70, 994,447.34 and 398,328.51

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Solution

The fourth proportional to 720,626.70, 994,447.34 and 398,328.51 is: 549,683.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,626.70 : 994,447.34 = 398,328.51 : x
  2. Step 2: Convert to fraction form
    720,626.70/994,447.34 = 398,328.51/x
  3. Step 3: Cross multiply
    720,626.70x = 994,447.34 × 398,328.51
  4. Step 4: Simplify right side
    720,626.70x = 396,116,725,224.02
  5. Step 5: Solve for x
    x = 396,116,725,224.02/720,626.70
  6. Step 6: Final answer
    x = 549,683.66

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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.