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Finding the Fourth Proportional to 553,651.12, 764,040.80 and 311,937.20

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Solution

The fourth proportional to 553,651.12, 764,040.80 and 311,937.20 is: 430,474.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,651.12 : 764,040.80 = 311,937.20 : x
  2. Step 2: Convert to fraction form
    553,651.12/764,040.80 = 311,937.20/x
  3. Step 3: Cross multiply
    553,651.12x = 764,040.80 × 311,937.20
  4. Step 4: Simplify right side
    553,651.12x = 238,332,744,017.56
  5. Step 5: Solve for x
    x = 238,332,744,017.56/553,651.12
  6. Step 6: Final answer
    x = 430,474.60

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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.