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Finding the Fourth Proportional to 875.21, 1,312.67 and 388.17

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Solution

The fourth proportional to 875.21, 1,312.67 and 388.17 is: 582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.21 : 1,312.67 = 388.17 : x
  2. Step 2: Convert to fraction form
    875.21/1,312.67 = 388.17/x
  3. Step 3: Cross multiply
    875.21x = 1,312.67 × 388.17
  4. Step 4: Simplify right side
    875.21x = 509,540.08
  5. Step 5: Solve for x
    x = 509,540.08/875.21
  6. Step 6: Final answer
    x = 582.20

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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.