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Finding the Fourth Proportional to 519,266.40, 778,899.60 and 318,937.20

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Solution

The fourth proportional to 519,266.40, 778,899.60 and 318,937.20 is: 478,405.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,266.40 : 778,899.60 = 318,937.20 : x
  2. Step 2: Convert to fraction form
    519,266.40/778,899.60 = 318,937.20/x
  3. Step 3: Cross multiply
    519,266.40x = 778,899.60 × 318,937.20
  4. Step 4: Simplify right side
    519,266.40x = 248,420,057,505.12
  5. Step 5: Solve for x
    x = 248,420,057,505.12/519,266.40
  6. Step 6: Final answer
    x = 478,405.80

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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.