Home / 428,423.10-642,634.65-328,890.30

Finding the Fourth Proportional to 428,423.10, 642,634.65 and 328,890.30

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Solution

The fourth proportional to 428,423.10, 642,634.65 and 328,890.30 is: 493,335.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,423.10 : 642,634.65 = 328,890.30 : x
  2. Step 2: Convert to fraction form
    428,423.10/642,634.65 = 328,890.30/x
  3. Step 3: Cross multiply
    428,423.10x = 642,634.65 × 328,890.30
  4. Step 4: Simplify right side
    428,423.10x = 211,356,302,828.90
  5. Step 5: Solve for x
    x = 211,356,302,828.90/428,423.10
  6. Step 6: Final answer
    x = 493,335.45

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1.5x scale

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.