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Finding the Fourth Proportional to 1,038.62, 1,558.13 and 345.21

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Solution

The fourth proportional to 1,038.62, 1,558.13 and 345.21 is: 517.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.62 : 1,558.13 = 345.21 : x
  2. Step 2: Convert to fraction form
    1,038.62/1,558.13 = 345.21/x
  3. Step 3: Cross multiply
    1,038.62x = 1,558.13 × 345.21
  4. Step 4: Simplify right side
    1,038.62x = 537,880.33
  5. Step 5: Solve for x
    x = 537,880.33/1,038.62
  6. Step 6: Final answer
    x = 517.88

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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.