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Finding the Fourth Proportional to 1,029.02, 1,420.03 and 556.90

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Solution

The fourth proportional to 1,029.02, 1,420.03 and 556.90 is: 768.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.02 : 1,420.03 = 556.90 : x
  2. Step 2: Convert to fraction form
    1,029.02/1,420.03 = 556.90/x
  3. Step 3: Cross multiply
    1,029.02x = 1,420.03 × 556.90
  4. Step 4: Simplify right side
    1,029.02x = 790,819.65
  5. Step 5: Solve for x
    x = 790,819.65/1,029.02
  6. Step 6: Final answer
    x = 768.52

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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.