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Finding the Fourth Proportional to 400,919.40, 601,379.10 and 120,400.20

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Solution

The fourth proportional to 400,919.40, 601,379.10 and 120,400.20 is: 180,600.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,919.40 : 601,379.10 = 120,400.20 : x
  2. Step 2: Convert to fraction form
    400,919.40/601,379.10 = 120,400.20/x
  3. Step 3: Cross multiply
    400,919.40x = 601,379.10 × 120,400.20
  4. Step 4: Simplify right side
    400,919.40x = 72,406,163,915.82
  5. Step 5: Solve for x
    x = 72,406,163,915.82/400,919.40
  6. Step 6: Final answer
    x = 180,600.30

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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.