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Finding the Fourth Proportional to 1,048.72, 1,572 and 399.28

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Solution

The fourth proportional to 1,048.72, 1,572 and 399.28 is: 598.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.72 : 1,572 = 399.28 : x
  2. Step 2: Convert to fraction form
    1,048.72/1,572 = 399.28/x
  3. Step 3: Cross multiply
    1,048.72x = 1,572 × 399.28
  4. Step 4: Simplify right side
    1,048.72x = 627,668.16
  5. Step 5: Solve for x
    x = 627,668.16/1,048.72
  6. Step 6: Final answer
    x = 598.51

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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.