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Finding the Fourth Proportional to 875.20, 1,313.10 and 388.59

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Solution

The fourth proportional to 875.20, 1,313.10 and 388.59 is: 583.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.20 : 1,313.10 = 388.59 : x
  2. Step 2: Convert to fraction form
    875.20/1,313.10 = 388.59/x
  3. Step 3: Cross multiply
    875.20x = 1,313.10 × 388.59
  4. Step 4: Simplify right side
    875.20x = 510,249.02
  5. Step 5: Solve for x
    x = 510,249.02/875.20
  6. Step 6: Final answer
    x = 583.01

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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.