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Finding the Fourth Proportional to 420,312.80, 630,469.20 and 370,449.20

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Solution

The fourth proportional to 420,312.80, 630,469.20 and 370,449.20 is: 555,673.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,312.80 : 630,469.20 = 370,449.20 : x
  2. Step 2: Convert to fraction form
    420,312.80/630,469.20 = 370,449.20/x
  3. Step 3: Cross multiply
    420,312.80x = 630,469.20 × 370,449.20
  4. Step 4: Simplify right side
    420,312.80x = 233,556,810,764.64
  5. Step 5: Solve for x
    x = 233,556,810,764.64/420,312.80
  6. Step 6: Final answer
    x = 555,673.80

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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.