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Finding the Fourth Proportional to 390.04, 583.68 and 287.08

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Solution

The fourth proportional to 390.04, 583.68 and 287.08 is: 429.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.04 : 583.68 = 287.08 : x
  2. Step 2: Convert to fraction form
    390.04/583.68 = 287.08/x
  3. Step 3: Cross multiply
    390.04x = 583.68 × 287.08
  4. Step 4: Simplify right side
    390.04x = 167,562.85
  5. Step 5: Solve for x
    x = 167,562.85/390.04
  6. Step 6: Final answer
    x = 429.60

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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.