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Finding the Fourth Proportional to 876.96, 1,315.71 and 390.15

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Solution

The fourth proportional to 876.96, 1,315.71 and 390.15 is: 585.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.96 : 1,315.71 = 390.15 : x
  2. Step 2: Convert to fraction form
    876.96/1,315.71 = 390.15/x
  3. Step 3: Cross multiply
    876.96x = 1,315.71 × 390.15
  4. Step 4: Simplify right side
    876.96x = 513,324.26
  5. Step 5: Solve for x
    x = 513,324.26/876.96
  6. Step 6: Final answer
    x = 585.35

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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.