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Finding the Fourth Proportional to 605,408.40, 910,080.90 and 429,136.20

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Solution

The fourth proportional to 605,408.40, 910,080.90 and 429,136.20 is: 645,099.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    605,408.40 : 910,080.90 = 429,136.20 : x
  2. Step 2: Convert to fraction form
    605,408.40/910,080.90 = 429,136.20/x
  3. Step 3: Cross multiply
    605,408.40x = 910,080.90 × 429,136.20
  4. Step 4: Simplify right side
    605,408.40x = 390,548,659,118.58
  5. Step 5: Solve for x
    x = 390,548,659,118.58/605,408.40
  6. Step 6: Final answer
    x = 645,099.50

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Double scale
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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.