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Finding the Fourth Proportional to 1,018.80, 1,405.20 and 625.68

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Solution

The fourth proportional to 1,018.80, 1,405.20 and 625.68 is: 862.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.80 : 1,405.20 = 625.68 : x
  2. Step 2: Convert to fraction form
    1,018.80/1,405.20 = 625.68/x
  3. Step 3: Cross multiply
    1,018.80x = 1,405.20 × 625.68
  4. Step 4: Simplify right side
    1,018.80x = 879,205.54
  5. Step 5: Solve for x
    x = 879,205.54/1,018.80
  6. Step 6: Final answer
    x = 862.98

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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.