Home / 428,931.45-643,725.63-308,930.76

Finding the Fourth Proportional to 428,931.45, 643,725.63 and 308,930.76

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Solution

The fourth proportional to 428,931.45, 643,725.63 and 308,930.76 is: 463,632.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,931.45 : 643,725.63 = 308,930.76 : x
  2. Step 2: Convert to fraction form
    428,931.45/643,725.63 = 308,930.76/x
  3. Step 3: Cross multiply
    428,931.45x = 643,725.63 × 308,930.76
  4. Step 4: Simplify right side
    428,931.45x = 198,866,648,107.38
  5. Step 5: Solve for x
    x = 198,866,648,107.38/428,931.45
  6. Step 6: Final answer
    x = 463,632.70

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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.