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Finding the Fourth Proportional to 1,038.45, 1,557.50 and 517.90

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Solution

The fourth proportional to 1,038.45, 1,557.50 and 517.90 is: 776.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.45 : 1,557.50 = 517.90 : x
  2. Step 2: Convert to fraction form
    1,038.45/1,557.50 = 517.90/x
  3. Step 3: Cross multiply
    1,038.45x = 1,557.50 × 517.90
  4. Step 4: Simplify right side
    1,038.45x = 806,618.87
  5. Step 5: Solve for x
    x = 806,618.87/1,038.45
  6. Step 6: Final answer
    x = 776.76

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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.