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Finding the Fourth Proportional to 1,421.00, 2,129.84 and 542.93

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Solution

The fourth proportional to 1,421.00, 2,129.84 and 542.93 is: 813.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.00 : 2,129.84 = 542.93 : x
  2. Step 2: Convert to fraction form
    1,421.00/2,129.84 = 542.93/x
  3. Step 3: Cross multiply
    1,421.00x = 2,129.84 × 542.93
  4. Step 4: Simplify right side
    1,421.00x = 1,156,340.67
  5. Step 5: Solve for x
    x = 1,156,340.67/1,421.00
  6. Step 6: Final answer
    x = 813.75

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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.