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Finding the Fourth Proportional to 1,029.69, 1,420.85 and 820.40

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Solution

The fourth proportional to 1,029.69, 1,420.85 and 820.40 is: 1,132.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.69 : 1,420.85 = 820.40 : x
  2. Step 2: Convert to fraction form
    1,029.69/1,420.85 = 820.40/x
  3. Step 3: Cross multiply
    1,029.69x = 1,420.85 × 820.40
  4. Step 4: Simplify right side
    1,029.69x = 1,165,665.34
  5. Step 5: Solve for x
    x = 1,165,665.34/1,029.69
  6. Step 6: Final answer
    x = 1,132.05

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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.