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Finding the Fourth Proportional to 355.12, 530.15 and 316.51

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Solution

The fourth proportional to 355.12, 530.15 and 316.51 is: 472.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.12 : 530.15 = 316.51 : x
  2. Step 2: Convert to fraction form
    355.12/530.15 = 316.51/x
  3. Step 3: Cross multiply
    355.12x = 530.15 × 316.51
  4. Step 4: Simplify right side
    355.12x = 167,794.87
  5. Step 5: Solve for x
    x = 167,794.87/355.12
  6. Step 6: Final answer
    x = 472.51

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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.