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Finding the Fourth Proportional to 877.35, 1,316.24 and 390.54

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Solution

The fourth proportional to 877.35, 1,316.24 and 390.54 is: 585.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.35 : 1,316.24 = 390.54 : x
  2. Step 2: Convert to fraction form
    877.35/1,316.24 = 390.54/x
  3. Step 3: Cross multiply
    877.35x = 1,316.24 × 390.54
  4. Step 4: Simplify right side
    877.35x = 514,044.37
  5. Step 5: Solve for x
    x = 514,044.37/877.35
  6. Step 6: Final answer
    x = 585.91

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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.