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Finding the Fourth Proportional to 1,208.31, 1,666.79 and 710.88

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Solution

The fourth proportional to 1,208.31, 1,666.79 and 710.88 is: 980.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.31 : 1,666.79 = 710.88 : x
  2. Step 2: Convert to fraction form
    1,208.31/1,666.79 = 710.88/x
  3. Step 3: Cross multiply
    1,208.31x = 1,666.79 × 710.88
  4. Step 4: Simplify right side
    1,208.31x = 1,184,880.54
  5. Step 5: Solve for x
    x = 1,184,880.54/1,208.31
  6. Step 6: Final answer
    x = 980.61

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1.5x scale

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.