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Finding the Fourth Proportional to 1,047.40, 1,570.16 and 397.68

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Solution

The fourth proportional to 1,047.40, 1,570.16 and 397.68 is: 596.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.40 : 1,570.16 = 397.68 : x
  2. Step 2: Convert to fraction form
    1,047.40/1,570.16 = 397.68/x
  3. Step 3: Cross multiply
    1,047.40x = 1,570.16 × 397.68
  4. Step 4: Simplify right side
    1,047.40x = 624,421.23
  5. Step 5: Solve for x
    x = 624,421.23/1,047.40
  6. Step 6: Final answer
    x = 596.16

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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.