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Finding the Fourth Proportional to 917.33, 1,376.05 and 390.14

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Solution

The fourth proportional to 917.33, 1,376.05 and 390.14 is: 585.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.33 : 1,376.05 = 390.14 : x
  2. Step 2: Convert to fraction form
    917.33/1,376.05 = 390.14/x
  3. Step 3: Cross multiply
    917.33x = 1,376.05 × 390.14
  4. Step 4: Simplify right side
    917.33x = 536,852.15
  5. Step 5: Solve for x
    x = 536,852.15/917.33
  6. Step 6: Final answer
    x = 585.23

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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.