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Finding the Fourth Proportional to 685,073.34, 945,718.47 and 398,488.86

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Solution

The fourth proportional to 685,073.34, 945,718.47 and 398,488.86 is: 550,099.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,073.34 : 945,718.47 = 398,488.86 : x
  2. Step 2: Convert to fraction form
    685,073.34/945,718.47 = 398,488.86/x
  3. Step 3: Cross multiply
    685,073.34x = 945,718.47 × 398,488.86
  4. Step 4: Simplify right side
    685,073.34x = 376,858,274,991.24
  5. Step 5: Solve for x
    x = 376,858,274,991.24/685,073.34
  6. Step 6: Final answer
    x = 550,099.17

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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.