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Finding the Fourth Proportional to 1,072.80, 1,480.40 and 630.68

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Solution

The fourth proportional to 1,072.80, 1,480.40 and 630.68 is: 870.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.80 : 1,480.40 = 630.68 : x
  2. Step 2: Convert to fraction form
    1,072.80/1,480.40 = 630.68/x
  3. Step 3: Cross multiply
    1,072.80x = 1,480.40 × 630.68
  4. Step 4: Simplify right side
    1,072.80x = 933,658.67
  5. Step 5: Solve for x
    x = 933,658.67/1,072.80
  6. Step 6: Final answer
    x = 870.30

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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.