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Finding the Fourth Proportional to 390.07, 534.80 and 383.18

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Solution

The fourth proportional to 390.07, 534.80 and 383.18 is: 525.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.07 : 534.80 = 383.18 : x
  2. Step 2: Convert to fraction form
    390.07/534.80 = 383.18/x
  3. Step 3: Cross multiply
    390.07x = 534.80 × 383.18
  4. Step 4: Simplify right side
    390.07x = 204,925.96
  5. Step 5: Solve for x
    x = 204,925.96/390.07
  6. Step 6: Final answer
    x = 525.36

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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.