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Finding the Fourth Proportional to 858.59, 1,288.73 and 448.05

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Solution

The fourth proportional to 858.59, 1,288.73 and 448.05 is: 672.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.59 : 1,288.73 = 448.05 : x
  2. Step 2: Convert to fraction form
    858.59/1,288.73 = 448.05/x
  3. Step 3: Cross multiply
    858.59x = 1,288.73 × 448.05
  4. Step 4: Simplify right side
    858.59x = 577,415.48
  5. Step 5: Solve for x
    x = 577,415.48/858.59
  6. Step 6: Final answer
    x = 672.52

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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.