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Finding the Fourth Proportional to 745.98, 1,118.95 and 421.35

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Solution

The fourth proportional to 745.98, 1,118.95 and 421.35 is: 632.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.98 : 1,118.95 = 421.35 : x
  2. Step 2: Convert to fraction form
    745.98/1,118.95 = 421.35/x
  3. Step 3: Cross multiply
    745.98x = 1,118.95 × 421.35
  4. Step 4: Simplify right side
    745.98x = 471,468.53
  5. Step 5: Solve for x
    x = 471,468.53/745.98
  6. Step 6: Final answer
    x = 632.01

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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.