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Finding the Fourth Proportional to 959.19, 1,438.32 and 666.45

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Solution

The fourth proportional to 959.19, 1,438.32 and 666.45 is: 999.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.19 : 1,438.32 = 666.45 : x
  2. Step 2: Convert to fraction form
    959.19/1,438.32 = 666.45/x
  3. Step 3: Cross multiply
    959.19x = 1,438.32 × 666.45
  4. Step 4: Simplify right side
    959.19x = 958,570.86
  5. Step 5: Solve for x
    x = 958,570.86/959.19
  6. Step 6: Final answer
    x = 999.36

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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.