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Finding the Fourth Proportional to 1,419.90, 2,128.83 and 542.34

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Solution

The fourth proportional to 1,419.90, 2,128.83 and 542.34 is: 813.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.90 : 2,128.83 = 542.34 : x
  2. Step 2: Convert to fraction form
    1,419.90/2,128.83 = 542.34/x
  3. Step 3: Cross multiply
    1,419.90x = 2,128.83 × 542.34
  4. Step 4: Simplify right side
    1,419.90x = 1,154,549.66
  5. Step 5: Solve for x
    x = 1,154,549.66/1,419.90
  6. Step 6: Final answer
    x = 813.12

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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.