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Finding the Fourth Proportional to 920.28, 1,378.32 and 554.16

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Solution

The fourth proportional to 920.28, 1,378.32 and 554.16 is: 829.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.28 : 1,378.32 = 554.16 : x
  2. Step 2: Convert to fraction form
    920.28/1,378.32 = 554.16/x
  3. Step 3: Cross multiply
    920.28x = 1,378.32 × 554.16
  4. Step 4: Simplify right side
    920.28x = 763,809.81
  5. Step 5: Solve for x
    x = 763,809.81/920.28
  6. Step 6: Final answer
    x = 829.98

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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.