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Finding the Fourth Proportional to 619,430.90, 855,181.08 and 390,184.70

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Solution

The fourth proportional to 619,430.90, 855,181.08 and 390,184.70 is: 538,685.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,430.90 : 855,181.08 = 390,184.70 : x
  2. Step 2: Convert to fraction form
    619,430.90/855,181.08 = 390,184.70/x
  3. Step 3: Cross multiply
    619,430.90x = 855,181.08 × 390,184.70
  4. Step 4: Simplify right side
    619,430.90x = 333,678,573,145.48
  5. Step 5: Solve for x
    x = 333,678,573,145.48/619,430.90
  6. Step 6: Final answer
    x = 538,685.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.