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Finding the Fourth Proportional to 1,020.46, 1,408.26 and 578.38

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Solution

The fourth proportional to 1,020.46, 1,408.26 and 578.38 is: 798.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.46 : 1,408.26 = 578.38 : x
  2. Step 2: Convert to fraction form
    1,020.46/1,408.26 = 578.38/x
  3. Step 3: Cross multiply
    1,020.46x = 1,408.26 × 578.38
  4. Step 4: Simplify right side
    1,020.46x = 814,509.42
  5. Step 5: Solve for x
    x = 814,509.42/1,020.46
  6. Step 6: Final answer
    x = 798.18

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1.5x scale

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.