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Finding the Fourth Proportional to 1,207.87, 1,667.70 and 955.40

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Solution

The fourth proportional to 1,207.87, 1,667.70 and 955.40 is: 1,319.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.87 : 1,667.70 = 955.40 : x
  2. Step 2: Convert to fraction form
    1,207.87/1,667.70 = 955.40/x
  3. Step 3: Cross multiply
    1,207.87x = 1,667.70 × 955.40
  4. Step 4: Simplify right side
    1,207.87x = 1,593,312.24
  5. Step 5: Solve for x
    x = 1,593,312.24/1,207.87
  6. Step 6: Final answer
    x = 1,319.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.