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Finding the Fourth Proportional to 680,953.54, 939,685.57 and 390,356.77

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Solution

The fourth proportional to 680,953.54, 939,685.57 and 390,356.77 is: 538,674.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,953.54 : 939,685.57 = 390,356.77 : x
  2. Step 2: Convert to fraction form
    680,953.54/939,685.57 = 390,356.77/x
  3. Step 3: Cross multiply
    680,953.54x = 939,685.57 × 390,356.77
  4. Step 4: Simplify right side
    680,953.54x = 366,812,624,119.52
  5. Step 5: Solve for x
    x = 366,812,624,119.52/680,953.54
  6. Step 6: Final answer
    x = 538,674.96

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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.