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Finding the Fourth Proportional to 575.40, 794.35 and 389.87

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Solution

The fourth proportional to 575.40, 794.35 and 389.87 is: 538.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.40 : 794.35 = 389.87 : x
  2. Step 2: Convert to fraction form
    575.40/794.35 = 389.87/x
  3. Step 3: Cross multiply
    575.40x = 794.35 × 389.87
  4. Step 4: Simplify right side
    575.40x = 309,693.23
  5. Step 5: Solve for x
    x = 309,693.23/575.40
  6. Step 6: Final answer
    x = 538.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.