Home / 1,029.85-1,421.20-557.75

Finding the Fourth Proportional to 1,029.85, 1,421.20 and 557.75

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Solution

The fourth proportional to 1,029.85, 1,421.20 and 557.75 is: 769.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.85 : 1,421.20 = 557.75 : x
  2. Step 2: Convert to fraction form
    1,029.85/1,421.20 = 557.75/x
  3. Step 3: Cross multiply
    1,029.85x = 1,421.20 × 557.75
  4. Step 4: Simplify right side
    1,029.85x = 792,671.51
  5. Step 5: Solve for x
    x = 792,671.51/1,029.85
  6. Step 6: Final answer
    x = 769.70

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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.