Home / 1,423.08-2,135.36-642.94

Finding the Fourth Proportional to 1,423.08, 2,135.36 and 642.94

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Solution

The fourth proportional to 1,423.08, 2,135.36 and 642.94 is: 964.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.08 : 2,135.36 = 642.94 : x
  2. Step 2: Convert to fraction form
    1,423.08/2,135.36 = 642.94/x
  3. Step 3: Cross multiply
    1,423.08x = 2,135.36 × 642.94
  4. Step 4: Simplify right side
    1,423.08x = 1,372,904.63
  5. Step 5: Solve for x
    x = 1,372,904.63/1,423.08
  6. Step 6: Final answer
    x = 964.74

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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.