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Finding the Fourth Proportional to 579,213.70, 868,820.55 and 478,830.40

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Solution

The fourth proportional to 579,213.70, 868,820.55 and 478,830.40 is: 718,245.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,213.70 : 868,820.55 = 478,830.40 : x
  2. Step 2: Convert to fraction form
    579,213.70/868,820.55 = 478,830.40/x
  3. Step 3: Cross multiply
    579,213.70x = 868,820.55 × 478,830.40
  4. Step 4: Simplify right side
    579,213.70x = 416,017,691,484.72
  5. Step 5: Solve for x
    x = 416,017,691,484.72/579,213.70
  6. Step 6: Final answer
    x = 718,245.60

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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.