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Finding the Fourth Proportional to 1,325.90, 1,988.87 and 632.63

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Solution

The fourth proportional to 1,325.90, 1,988.87 and 632.63 is: 948.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.90 : 1,988.87 = 632.63 : x
  2. Step 2: Convert to fraction form
    1,325.90/1,988.87 = 632.63/x
  3. Step 3: Cross multiply
    1,325.90x = 1,988.87 × 632.63
  4. Step 4: Simplify right side
    1,325.90x = 1,258,220.64
  5. Step 5: Solve for x
    x = 1,258,220.64/1,325.90
  6. Step 6: Final answer
    x = 948.95

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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.