Home / 428,621.28-643,038.83-302,507.86

Finding the Fourth Proportional to 428,621.28, 643,038.83 and 302,507.86

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Solution

The fourth proportional to 428,621.28, 643,038.83 and 302,507.86 is: 453,837.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,621.28 : 643,038.83 = 302,507.86 : x
  2. Step 2: Convert to fraction form
    428,621.28/643,038.83 = 302,507.86/x
  3. Step 3: Cross multiply
    428,621.28x = 643,038.83 × 302,507.86
  4. Step 4: Simplify right side
    428,621.28x = 194,524,300,360.20
  5. Step 5: Solve for x
    x = 194,524,300,360.20/428,621.28
  6. Step 6: Final answer
    x = 453,837.24

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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.