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Finding the Fourth Proportional to 400,878.40, 601,317.60 and 120,359.20

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Solution

The fourth proportional to 400,878.40, 601,317.60 and 120,359.20 is: 180,538.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,878.40 : 601,317.60 = 120,359.20 : x
  2. Step 2: Convert to fraction form
    400,878.40/601,317.60 = 120,359.20/x
  3. Step 3: Cross multiply
    400,878.40x = 601,317.60 × 120,359.20
  4. Step 4: Simplify right side
    400,878.40x = 72,374,105,281.92
  5. Step 5: Solve for x
    x = 72,374,105,281.92/400,878.40
  6. Step 6: Final answer
    x = 180,538.80

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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.