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Finding the Fourth Proportional to 478,767.60, 660,679.20 and 306,442.80

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Solution

The fourth proportional to 478,767.60, 660,679.20 and 306,442.80 is: 422,878.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,767.60 : 660,679.20 = 306,442.80 : x
  2. Step 2: Convert to fraction form
    478,767.60/660,679.20 = 306,442.80/x
  3. Step 3: Cross multiply
    478,767.60x = 660,679.20 × 306,442.80
  4. Step 4: Simplify right side
    478,767.60x = 202,460,383,949.76
  5. Step 5: Solve for x
    x = 202,460,383,949.76/478,767.60
  6. Step 6: Final answer
    x = 422,878.21

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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.