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Finding the Fourth Proportional to 1,314.88, 1,972.25 and 665.60

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Solution

The fourth proportional to 1,314.88, 1,972.25 and 665.60 is: 998.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.88 : 1,972.25 = 665.60 : x
  2. Step 2: Convert to fraction form
    1,314.88/1,972.25 = 665.60/x
  3. Step 3: Cross multiply
    1,314.88x = 1,972.25 × 665.60
  4. Step 4: Simplify right side
    1,314.88x = 1,312,718.91
  5. Step 5: Solve for x
    x = 1,312,718.91/1,314.88
  6. Step 6: Final answer
    x = 998.36

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1.5x scale

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.