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Finding the Fourth Proportional to 877.28, 1,316.30 and 390.44

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Solution

The fourth proportional to 877.28, 1,316.30 and 390.44 is: 585.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.28 : 1,316.30 = 390.44 : x
  2. Step 2: Convert to fraction form
    877.28/1,316.30 = 390.44/x
  3. Step 3: Cross multiply
    877.28x = 1,316.30 × 390.44
  4. Step 4: Simplify right side
    877.28x = 513,936.17
  5. Step 5: Solve for x
    x = 513,936.17/877.28
  6. Step 6: Final answer
    x = 585.83

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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.