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Finding the Fourth Proportional to 1,047.16, 1,571.40 and 397.96

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Solution

The fourth proportional to 1,047.16, 1,571.40 and 397.96 is: 597.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.16 : 1,571.40 = 397.96 : x
  2. Step 2: Convert to fraction form
    1,047.16/1,571.40 = 397.96/x
  3. Step 3: Cross multiply
    1,047.16x = 1,571.40 × 397.96
  4. Step 4: Simplify right side
    1,047.16x = 625,354.34
  5. Step 5: Solve for x
    x = 625,354.34/1,047.16
  6. Step 6: Final answer
    x = 597.19

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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.