Home / 1,325.81-1,988.20-631.95

Finding the Fourth Proportional to 1,325.81, 1,988.20 and 631.95

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Solution

The fourth proportional to 1,325.81, 1,988.20 and 631.95 is: 947.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.81 : 1,988.20 = 631.95 : x
  2. Step 2: Convert to fraction form
    1,325.81/1,988.20 = 631.95/x
  3. Step 3: Cross multiply
    1,325.81x = 1,988.20 × 631.95
  4. Step 4: Simplify right side
    1,325.81x = 1,256,442.99
  5. Step 5: Solve for x
    x = 1,256,442.99/1,325.81
  6. Step 6: Final answer
    x = 947.68

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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.