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Finding the Fourth Proportional to 1,047.87, 1,571.18 and 431.98

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Solution

The fourth proportional to 1,047.87, 1,571.18 and 431.98 is: 647.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.87 : 1,571.18 = 431.98 : x
  2. Step 2: Convert to fraction form
    1,047.87/1,571.18 = 431.98/x
  3. Step 3: Cross multiply
    1,047.87x = 1,571.18 × 431.98
  4. Step 4: Simplify right side
    1,047.87x = 678,712.25
  5. Step 5: Solve for x
    x = 678,712.25/1,047.87
  6. Step 6: Final answer
    x = 647.71

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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.