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Finding the Fourth Proportional to 1,048.40, 1,572.80 and 399.59

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Solution

The fourth proportional to 1,048.40, 1,572.80 and 399.59 is: 599.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.40 : 1,572.80 = 399.59 : x
  2. Step 2: Convert to fraction form
    1,048.40/1,572.80 = 399.59/x
  3. Step 3: Cross multiply
    1,048.40x = 1,572.80 × 399.59
  4. Step 4: Simplify right side
    1,048.40x = 628,465.29
  5. Step 5: Solve for x
    x = 628,465.29/1,048.40
  6. Step 6: Final answer
    x = 599.45

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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.