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Finding the Fourth Proportional to 1,325.71, 1,988.60 and 632.45

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Solution

The fourth proportional to 1,325.71, 1,988.60 and 632.45 is: 948.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.71 : 1,988.60 = 632.45 : x
  2. Step 2: Convert to fraction form
    1,325.71/1,988.60 = 632.45/x
  3. Step 3: Cross multiply
    1,325.71x = 1,988.60 × 632.45
  4. Step 4: Simplify right side
    1,325.71x = 1,257,690.07
  5. Step 5: Solve for x
    x = 1,257,690.07/1,325.71
  6. Step 6: Final answer
    x = 948.69

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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.