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Finding the Fourth Proportional to 1,006.89, 1,390.31 and 671.12

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Solution

The fourth proportional to 1,006.89, 1,390.31 and 671.12 is: 926.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.89 : 1,390.31 = 671.12 : x
  2. Step 2: Convert to fraction form
    1,006.89/1,390.31 = 671.12/x
  3. Step 3: Cross multiply
    1,006.89x = 1,390.31 × 671.12
  4. Step 4: Simplify right side
    1,006.89x = 933,064.85
  5. Step 5: Solve for x
    x = 933,064.85/1,006.89
  6. Step 6: Final answer
    x = 926.68

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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.