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Finding the Fourth Proportional to 421,453.20, 630,624.60 and 384,128.40

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Solution

The fourth proportional to 421,453.20, 630,624.60 and 384,128.40 is: 574,775.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,453.20 : 630,624.60 = 384,128.40 : x
  2. Step 2: Convert to fraction form
    421,453.20/630,624.60 = 384,128.40/x
  3. Step 3: Cross multiply
    421,453.20x = 630,624.60 × 384,128.40
  4. Step 4: Simplify right side
    421,453.20x = 242,240,818,598.64
  5. Step 5: Solve for x
    x = 242,240,818,598.64/421,453.20
  6. Step 6: Final answer
    x = 574,775.13

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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.