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Finding the Fourth Proportional to 720,420.42, 994,200.12 and 398,150.76

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Solution

The fourth proportional to 720,420.42, 994,200.12 and 398,150.76 is: 549,459.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,420.42 : 994,200.12 = 398,150.76 : x
  2. Step 2: Convert to fraction form
    720,420.42/994,200.12 = 398,150.76/x
  3. Step 3: Cross multiply
    720,420.42x = 994,200.12 × 398,150.76
  4. Step 4: Simplify right side
    720,420.42x = 395,841,533,370.09
  5. Step 5: Solve for x
    x = 395,841,533,370.09/720,420.42
  6. Step 6: Final answer
    x = 549,459.07

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Double scale
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Similar ratio
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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.