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Finding the Fourth Proportional to 959.86, 1,438.43 and 497.45

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Solution

The fourth proportional to 959.86, 1,438.43 and 497.45 is: 745.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.86 : 1,438.43 = 497.45 : x
  2. Step 2: Convert to fraction form
    959.86/1,438.43 = 497.45/x
  3. Step 3: Cross multiply
    959.86x = 1,438.43 × 497.45
  4. Step 4: Simplify right side
    959.86x = 715,548.11
  5. Step 5: Solve for x
    x = 715,548.11/959.86
  6. Step 6: Final answer
    x = 745.47

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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.