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Finding the Fourth Proportional to 421,451.20, 630,621.60 and 384,126.40

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Solution

The fourth proportional to 421,451.20, 630,621.60 and 384,126.40 is: 574,772.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,451.20 : 630,621.60 = 384,126.40 : x
  2. Step 2: Convert to fraction form
    421,451.20/630,621.60 = 384,126.40/x
  3. Step 3: Cross multiply
    421,451.20x = 630,621.60 × 384,126.40
  4. Step 4: Simplify right side
    421,451.20x = 242,238,404,970.24
  5. Step 5: Solve for x
    x = 242,238,404,970.24/421,451.20
  6. Step 6: Final answer
    x = 574,772.13

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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.