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Finding the Fourth Proportional to 356.40, 530.28 and 355.12

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Solution

The fourth proportional to 356.40, 530.28 and 355.12 is: 528.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.40 : 530.28 = 355.12 : x
  2. Step 2: Convert to fraction form
    356.40/530.28 = 355.12/x
  3. Step 3: Cross multiply
    356.40x = 530.28 × 355.12
  4. Step 4: Simplify right side
    356.40x = 188,313.03
  5. Step 5: Solve for x
    x = 188,313.03/356.40
  6. Step 6: Final answer
    x = 528.38

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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.