Home / 420,431.40-630,647.10-388,636.20

Finding the Fourth Proportional to 420,431.40, 630,647.10 and 388,636.20

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Solution

The fourth proportional to 420,431.40, 630,647.10 and 388,636.20 is: 582,954.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,431.40 : 630,647.10 = 388,636.20 : x
  2. Step 2: Convert to fraction form
    420,431.40/630,647.10 = 388,636.20/x
  3. Step 3: Cross multiply
    420,431.40x = 630,647.10 × 388,636.20
  4. Step 4: Simplify right side
    420,431.40x = 245,092,292,485.02
  5. Step 5: Solve for x
    x = 245,092,292,485.02/420,431.40
  6. Step 6: Final answer
    x = 582,954.30

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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.