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Finding the Fourth Proportional to 1,325.31, 1,987.43 and 631.28

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Solution

The fourth proportional to 1,325.31, 1,987.43 and 631.28 is: 946.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.31 : 1,987.43 = 631.28 : x
  2. Step 2: Convert to fraction form
    1,325.31/1,987.43 = 631.28/x
  3. Step 3: Cross multiply
    1,325.31x = 1,987.43 × 631.28
  4. Step 4: Simplify right side
    1,325.31x = 1,254,611.72
  5. Step 5: Solve for x
    x = 1,254,611.72/1,325.31
  6. Step 6: Final answer
    x = 946.66

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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.