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Finding the Fourth Proportional to 391.02, 583.37 and 355.65

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Solution

The fourth proportional to 391.02, 583.37 and 355.65 is: 530.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.02 : 583.37 = 355.65 : x
  2. Step 2: Convert to fraction form
    391.02/583.37 = 355.65/x
  3. Step 3: Cross multiply
    391.02x = 583.37 × 355.65
  4. Step 4: Simplify right side
    391.02x = 207,473.76
  5. Step 5: Solve for x
    x = 207,473.76/391.02
  6. Step 6: Final answer
    x = 530.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.