Home / 1,142.11-1,712.10-621.35

Finding the Fourth Proportional to 1,142.11, 1,712.10 and 621.35

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Solution

The fourth proportional to 1,142.11, 1,712.10 and 621.35 is: 931.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.11 : 1,712.10 = 621.35 : x
  2. Step 2: Convert to fraction form
    1,142.11/1,712.10 = 621.35/x
  3. Step 3: Cross multiply
    1,142.11x = 1,712.10 × 621.35
  4. Step 4: Simplify right side
    1,142.11x = 1,063,813.34
  5. Step 5: Solve for x
    x = 1,063,813.34/1,142.11
  6. Step 6: Final answer
    x = 931.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.