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Finding the Fourth Proportional to 1,020.49, 1,408.86 and 672.19

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Solution

The fourth proportional to 1,020.49, 1,408.86 and 672.19 is: 928.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.49 : 1,408.86 = 672.19 : x
  2. Step 2: Convert to fraction form
    1,020.49/1,408.86 = 672.19/x
  3. Step 3: Cross multiply
    1,020.49x = 1,408.86 × 672.19
  4. Step 4: Simplify right side
    1,020.49x = 947,011.20
  5. Step 5: Solve for x
    x = 947,011.20/1,020.49
  6. Step 6: Final answer
    x = 928.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.