Home / 681,065.16-939,787.62-390,661.68

Finding the Fourth Proportional to 681,065.16, 939,787.62 and 390,661.68

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Solution

The fourth proportional to 681,065.16, 939,787.62 and 390,661.68 is: 539,065.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,065.16 : 939,787.62 = 390,661.68 : x
  2. Step 2: Convert to fraction form
    681,065.16/939,787.62 = 390,661.68/x
  3. Step 3: Cross multiply
    681,065.16x = 939,787.62 × 390,661.68
  4. Step 4: Simplify right side
    681,065.16x = 367,139,010,472.40
  5. Step 5: Solve for x
    x = 367,139,010,472.40/681,065.16
  6. Step 6: Final answer
    x = 539,065.91

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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.