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Finding the Fourth Proportional to 354.74, 530.90 and 260.40

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Solution

The fourth proportional to 354.74, 530.90 and 260.40 is: 389.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.74 : 530.90 = 260.40 : x
  2. Step 2: Convert to fraction form
    354.74/530.90 = 260.40/x
  3. Step 3: Cross multiply
    354.74x = 530.90 × 260.40
  4. Step 4: Simplify right side
    354.74x = 138,246.36
  5. Step 5: Solve for x
    x = 138,246.36/354.74
  6. Step 6: Final answer
    x = 389.71

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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.