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Finding the Fourth Proportional to 959.40, 1,438.65 and 342.93

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Solution

The fourth proportional to 959.40, 1,438.65 and 342.93 is: 514.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.40 : 1,438.65 = 342.93 : x
  2. Step 2: Convert to fraction form
    959.40/1,438.65 = 342.93/x
  3. Step 3: Cross multiply
    959.40x = 1,438.65 × 342.93
  4. Step 4: Simplify right side
    959.40x = 493,356.24
  5. Step 5: Solve for x
    x = 493,356.24/959.40
  6. Step 6: Final answer
    x = 514.23

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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.