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Finding the Fourth Proportional to 714,238.90, 985,661.78 and 391,978.98

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Solution

The fourth proportional to 714,238.90, 985,661.78 and 391,978.98 is: 540,937.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,238.90 : 985,661.78 = 391,978.98 : x
  2. Step 2: Convert to fraction form
    714,238.90/985,661.78 = 391,978.98/x
  3. Step 3: Cross multiply
    714,238.90x = 985,661.78 × 391,978.98
  4. Step 4: Simplify right side
    714,238.90x = 386,358,699,149.38
  5. Step 5: Solve for x
    x = 386,358,699,149.38/714,238.90
  6. Step 6: Final answer
    x = 540,937.63

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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.