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Finding the Fourth Proportional to 1,260.38, 1,890.38 and 438.72

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Solution

The fourth proportional to 1,260.38, 1,890.38 and 438.72 is: 658.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.38 : 1,890.38 = 438.72 : x
  2. Step 2: Convert to fraction form
    1,260.38/1,890.38 = 438.72/x
  3. Step 3: Cross multiply
    1,260.38x = 1,890.38 × 438.72
  4. Step 4: Simplify right side
    1,260.38x = 829,347.51
  5. Step 5: Solve for x
    x = 829,347.51/1,260.38
  6. Step 6: Final answer
    x = 658.01

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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.