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Finding the Fourth Proportional to 1,029.42, 1,421.22 and 675.90

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Solution

The fourth proportional to 1,029.42, 1,421.22 and 675.90 is: 933.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.42 : 1,421.22 = 675.90 : x
  2. Step 2: Convert to fraction form
    1,029.42/1,421.22 = 675.90/x
  3. Step 3: Cross multiply
    1,029.42x = 1,421.22 × 675.90
  4. Step 4: Simplify right side
    1,029.42x = 960,602.60
  5. Step 5: Solve for x
    x = 960,602.60/1,029.42
  6. Step 6: Final answer
    x = 933.15

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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.