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Finding the Fourth Proportional to 1,047.19, 1,570.78 and 398.18

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Solution

The fourth proportional to 1,047.19, 1,570.78 and 398.18 is: 597.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.19 : 1,570.78 = 398.18 : x
  2. Step 2: Convert to fraction form
    1,047.19/1,570.78 = 398.18/x
  3. Step 3: Cross multiply
    1,047.19x = 1,570.78 × 398.18
  4. Step 4: Simplify right side
    1,047.19x = 625,453.18
  5. Step 5: Solve for x
    x = 625,453.18/1,047.19
  6. Step 6: Final answer
    x = 597.27

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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.