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Finding the Fourth Proportional to 877.27, 1,316.21 and 390.36

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Solution

The fourth proportional to 877.27, 1,316.21 and 390.36 is: 585.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.27 : 1,316.21 = 390.36 : x
  2. Step 2: Convert to fraction form
    877.27/1,316.21 = 390.36/x
  3. Step 3: Cross multiply
    877.27x = 1,316.21 × 390.36
  4. Step 4: Simplify right side
    877.27x = 513,793.78
  5. Step 5: Solve for x
    x = 513,793.78/877.27
  6. Step 6: Final answer
    x = 585.68

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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.