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Finding the Fourth Proportional to 875.53, 1,313.78 and 388.57

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Solution

The fourth proportional to 875.53, 1,313.78 and 388.57 is: 583.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.53 : 1,313.78 = 388.57 : x
  2. Step 2: Convert to fraction form
    875.53/1,313.78 = 388.57/x
  3. Step 3: Cross multiply
    875.53x = 1,313.78 × 388.57
  4. Step 4: Simplify right side
    875.53x = 510,499.16
  5. Step 5: Solve for x
    x = 510,499.16/875.53
  6. Step 6: Final answer
    x = 583.07

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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.