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Finding the Fourth Proportional to 575.88, 862.64 and 390.20

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Solution

The fourth proportional to 575.88, 862.64 and 390.20 is: 584.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.88 : 862.64 = 390.20 : x
  2. Step 2: Convert to fraction form
    575.88/862.64 = 390.20/x
  3. Step 3: Cross multiply
    575.88x = 862.64 × 390.20
  4. Step 4: Simplify right side
    575.88x = 336,602.13
  5. Step 5: Solve for x
    x = 336,602.13/575.88
  6. Step 6: Final answer
    x = 584.50

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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.