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Finding the Fourth Proportional to 858.74, 1,288.80 and 448

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Solution

The fourth proportional to 858.74, 1,288.80 and 448 is: 672.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.74 : 1,288.80 = 448 : x
  2. Step 2: Convert to fraction form
    858.74/1,288.80 = 448/x
  3. Step 3: Cross multiply
    858.74x = 1,288.80 × 448
  4. Step 4: Simplify right side
    858.74x = 577,382.40
  5. Step 5: Solve for x
    x = 577,382.40/858.74
  6. Step 6: Final answer
    x = 672.36

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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.