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Finding the Fourth Proportional to 656,441.80, 982,694.40 and 390,065.20

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Solution

The fourth proportional to 656,441.80, 982,694.40 and 390,065.20 is: 583,928.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,441.80 : 982,694.40 = 390,065.20 : x
  2. Step 2: Convert to fraction form
    656,441.80/982,694.40 = 390,065.20/x
  3. Step 3: Cross multiply
    656,441.80x = 982,694.40 × 390,065.20
  4. Step 4: Simplify right side
    656,441.80x = 383,314,887,674.88
  5. Step 5: Solve for x
    x = 383,314,887,674.88/656,441.80
  6. Step 6: Final answer
    x = 583,928.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.