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Finding the Fourth Proportional to 875.94, 1,313.91 and 388.65

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Solution

The fourth proportional to 875.94, 1,313.91 and 388.65 is: 582.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.94 : 1,313.91 = 388.65 : x
  2. Step 2: Convert to fraction form
    875.94/1,313.91 = 388.65/x
  3. Step 3: Cross multiply
    875.94x = 1,313.91 × 388.65
  4. Step 4: Simplify right side
    875.94x = 510,651.12
  5. Step 5: Solve for x
    x = 510,651.12/875.94
  6. Step 6: Final answer
    x = 582.98

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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.