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Finding the Fourth Proportional to 1,259.98, 1,889.36 and 438.30

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Solution

The fourth proportional to 1,259.98, 1,889.36 and 438.30 is: 657.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.98 : 1,889.36 = 438.30 : x
  2. Step 2: Convert to fraction form
    1,259.98/1,889.36 = 438.30/x
  3. Step 3: Cross multiply
    1,259.98x = 1,889.36 × 438.30
  4. Step 4: Simplify right side
    1,259.98x = 828,106.49
  5. Step 5: Solve for x
    x = 828,106.49/1,259.98
  6. Step 6: Final answer
    x = 657.24

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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.