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Finding the Fourth Proportional to 525,788.60, 788,682.90 and 420,812.60

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Solution

The fourth proportional to 525,788.60, 788,682.90 and 420,812.60 is: 631,218.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,788.60 : 788,682.90 = 420,812.60 : x
  2. Step 2: Convert to fraction form
    525,788.60/788,682.90 = 420,812.60/x
  3. Step 3: Cross multiply
    525,788.60x = 788,682.90 × 420,812.60
  4. Step 4: Simplify right side
    525,788.60x = 331,887,701,724.54
  5. Step 5: Solve for x
    x = 331,887,701,724.54/525,788.60
  6. Step 6: Final answer
    x = 631,218.90

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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.