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Finding the Fourth Proportional to 318,977.40, 478,466.10 and 266,878.20

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Solution

The fourth proportional to 318,977.40, 478,466.10 and 266,878.20 is: 400,317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,977.40 : 478,466.10 = 266,878.20 : x
  2. Step 2: Convert to fraction form
    318,977.40/478,466.10 = 266,878.20/x
  3. Step 3: Cross multiply
    318,977.40x = 478,466.10 × 266,878.20
  4. Step 4: Simplify right side
    318,977.40x = 127,692,171,529.02
  5. Step 5: Solve for x
    x = 127,692,171,529.02/318,977.40
  6. Step 6: Final answer
    x = 400,317.30

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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.