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Finding the Fourth Proportional to 720,518.60, 994,367.15 and 398,221.76

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Solution

The fourth proportional to 720,518.60, 994,367.15 and 398,221.76 is: 549,574.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,518.60 : 994,367.15 = 398,221.76 : x
  2. Step 2: Convert to fraction form
    720,518.60/994,367.15 = 398,221.76/x
  3. Step 3: Cross multiply
    720,518.60x = 994,367.15 × 398,221.76
  4. Step 4: Simplify right side
    720,518.60x = 395,978,636,559.18
  5. Step 5: Solve for x
    x = 395,978,636,559.18/720,518.60
  6. Step 6: Final answer
    x = 549,574.48

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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.