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Finding the Fourth Proportional to 1,272.04, 1,907.80 and 439.06

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Solution

The fourth proportional to 1,272.04, 1,907.80 and 439.06 is: 658.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.04 : 1,907.80 = 439.06 : x
  2. Step 2: Convert to fraction form
    1,272.04/1,907.80 = 439.06/x
  3. Step 3: Cross multiply
    1,272.04x = 1,907.80 × 439.06
  4. Step 4: Simplify right side
    1,272.04x = 837,638.67
  5. Step 5: Solve for x
    x = 837,638.67/1,272.04
  6. Step 6: Final answer
    x = 658.50

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1.5x scale

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.