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Finding the Fourth Proportional to 933.60, 1,399.20 and 386.16

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Solution

The fourth proportional to 933.60, 1,399.20 and 386.16 is: 578.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.60 : 1,399.20 = 386.16 : x
  2. Step 2: Convert to fraction form
    933.60/1,399.20 = 386.16/x
  3. Step 3: Cross multiply
    933.60x = 1,399.20 × 386.16
  4. Step 4: Simplify right side
    933.60x = 540,315.07
  5. Step 5: Solve for x
    x = 540,315.07/933.60
  6. Step 6: Final answer
    x = 578.74

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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.