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Finding the Fourth Proportional to 355.65, 530.61 and 316.67

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Solution

The fourth proportional to 355.65, 530.61 and 316.67 is: 472.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.65 : 530.61 = 316.67 : x
  2. Step 2: Convert to fraction form
    355.65/530.61 = 316.67/x
  3. Step 3: Cross multiply
    355.65x = 530.61 × 316.67
  4. Step 4: Simplify right side
    355.65x = 168,025.62
  5. Step 5: Solve for x
    x = 168,025.62/355.65
  6. Step 6: Final answer
    x = 472.45

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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.