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Finding the Fourth Proportional to 1,038.35, 1,557.97 and 345.11

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Solution

The fourth proportional to 1,038.35, 1,557.97 and 345.11 is: 517.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.35 : 1,557.97 = 345.11 : x
  2. Step 2: Convert to fraction form
    1,038.35/1,557.97 = 345.11/x
  3. Step 3: Cross multiply
    1,038.35x = 1,557.97 × 345.11
  4. Step 4: Simplify right side
    1,038.35x = 537,671.03
  5. Step 5: Solve for x
    x = 537,671.03/1,038.35
  6. Step 6: Final answer
    x = 517.81

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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.