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Finding the Fourth Proportional to 875.67, 1,312.61 and 388.61

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Solution

The fourth proportional to 875.67, 1,312.61 and 388.61 is: 582.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.67 : 1,312.61 = 388.61 : x
  2. Step 2: Convert to fraction form
    875.67/1,312.61 = 388.61/x
  3. Step 3: Cross multiply
    875.67x = 1,312.61 × 388.61
  4. Step 4: Simplify right side
    875.67x = 510,084.87
  5. Step 5: Solve for x
    x = 510,084.87/875.67
  6. Step 6: Final answer
    x = 582.51

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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.