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Finding the Fourth Proportional to 355.60, 530.99 and 290.72

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Solution

The fourth proportional to 355.60, 530.99 and 290.72 is: 434.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.60 : 530.99 = 290.72 : x
  2. Step 2: Convert to fraction form
    355.60/530.99 = 290.72/x
  3. Step 3: Cross multiply
    355.60x = 530.99 × 290.72
  4. Step 4: Simplify right side
    355.60x = 154,371.47
  5. Step 5: Solve for x
    x = 154,371.47/355.60
  6. Step 6: Final answer
    x = 434.12

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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.