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Finding the Fourth Proportional to 1,324.71, 1,987.10 and 631.45

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Solution

The fourth proportional to 1,324.71, 1,987.10 and 631.45 is: 947.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.71 : 1,987.10 = 631.45 : x
  2. Step 2: Convert to fraction form
    1,324.71/1,987.10 = 631.45/x
  3. Step 3: Cross multiply
    1,324.71x = 1,987.10 × 631.45
  4. Step 4: Simplify right side
    1,324.71x = 1,254,741.20
  5. Step 5: Solve for x
    x = 1,254,741.20/1,324.71
  6. Step 6: Final answer
    x = 947.19

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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.