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Finding the Fourth Proportional to 386.10, 529.20 and 383.40

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Solution

The fourth proportional to 386.10, 529.20 and 383.40 is: 525.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.10 : 529.20 = 383.40 : x
  2. Step 2: Convert to fraction form
    386.10/529.20 = 383.40/x
  3. Step 3: Cross multiply
    386.10x = 529.20 × 383.40
  4. Step 4: Simplify right side
    386.10x = 202,895.28
  5. Step 5: Solve for x
    x = 202,895.28/386.10
  6. Step 6: Final answer
    x = 525.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.