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Finding the Fourth Proportional to 526,276.40, 789,414.60 and 421,300.40

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Solution

The fourth proportional to 526,276.40, 789,414.60 and 421,300.40 is: 631,950.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    526,276.40 : 789,414.60 = 421,300.40 : x
  2. Step 2: Convert to fraction form
    526,276.40/789,414.60 = 421,300.40/x
  3. Step 3: Cross multiply
    526,276.40x = 789,414.60 × 421,300.40
  4. Step 4: Simplify right side
    526,276.40x = 332,580,686,745.84
  5. Step 5: Solve for x
    x = 332,580,686,745.84/526,276.40
  6. Step 6: Final answer
    x = 631,950.60

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.