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Finding the Fourth Proportional to 518,944.40, 778,416.60 and 318,615.20

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Solution

The fourth proportional to 518,944.40, 778,416.60 and 318,615.20 is: 477,922.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,944.40 : 778,416.60 = 318,615.20 : x
  2. Step 2: Convert to fraction form
    518,944.40/778,416.60 = 318,615.20/x
  3. Step 3: Cross multiply
    518,944.40x = 778,416.60 × 318,615.20
  4. Step 4: Simplify right side
    518,944.40x = 248,015,360,692.32
  5. Step 5: Solve for x
    x = 248,015,360,692.32/518,944.40
  6. Step 6: Final answer
    x = 477,922.80

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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.