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Finding the Fourth Proportional to 524,986.60, 787,479.90 and 420,010.60

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Solution

The fourth proportional to 524,986.60, 787,479.90 and 420,010.60 is: 630,015.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    524,986.60 : 787,479.90 = 420,010.60 : x
  2. Step 2: Convert to fraction form
    524,986.60/787,479.90 = 420,010.60/x
  3. Step 3: Cross multiply
    524,986.60x = 787,479.90 × 420,010.60
  4. Step 4: Simplify right side
    524,986.60x = 330,749,905,286.94
  5. Step 5: Solve for x
    x = 330,749,905,286.94/524,986.60
  6. Step 6: Final answer
    x = 630,015.90

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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.