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Finding the Fourth Proportional to 525,136.40, 787,704.60 and 420,160.40

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Solution

The fourth proportional to 525,136.40, 787,704.60 and 420,160.40 is: 630,240.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,136.40 : 787,704.60 = 420,160.40 : x
  2. Step 2: Convert to fraction form
    525,136.40/787,704.60 = 420,160.40/x
  3. Step 3: Cross multiply
    525,136.40x = 787,704.60 × 420,160.40
  4. Step 4: Simplify right side
    525,136.40x = 330,962,279,817.84
  5. Step 5: Solve for x
    x = 330,962,279,817.84/525,136.40
  6. Step 6: Final answer
    x = 630,240.60

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Similar ratio
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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.