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Finding the Fourth Proportional to 390.53, 586.95 and 361.89

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Solution

The fourth proportional to 390.53, 586.95 and 361.89 is: 543.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.53 : 586.95 = 361.89 : x
  2. Step 2: Convert to fraction form
    390.53/586.95 = 361.89/x
  3. Step 3: Cross multiply
    390.53x = 586.95 × 361.89
  4. Step 4: Simplify right side
    390.53x = 212,411.34
  5. Step 5: Solve for x
    x = 212,411.34/390.53
  6. Step 6: Final answer
    x = 543.91

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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.