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Finding the Fourth Proportional to 478,421.70, 717,632.55 and 455,093.70

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Solution

The fourth proportional to 478,421.70, 717,632.55 and 455,093.70 is: 682,640.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,421.70 : 717,632.55 = 455,093.70 : x
  2. Step 2: Convert to fraction form
    478,421.70/717,632.55 = 455,093.70/x
  3. Step 3: Cross multiply
    478,421.70x = 717,632.55 × 455,093.70
  4. Step 4: Simplify right side
    478,421.70x = 326,590,052,419.94
  5. Step 5: Solve for x
    x = 326,590,052,419.94/478,421.70
  6. Step 6: Final answer
    x = 682,640.55

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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.