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Finding the Fourth Proportional to 1,325.70, 1,988.16 and 631.98

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Solution

The fourth proportional to 1,325.70, 1,988.16 and 631.98 is: 947.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.70 : 1,988.16 = 631.98 : x
  2. Step 2: Convert to fraction form
    1,325.70/1,988.16 = 631.98/x
  3. Step 3: Cross multiply
    1,325.70x = 1,988.16 × 631.98
  4. Step 4: Simplify right side
    1,325.70x = 1,256,477.36
  5. Step 5: Solve for x
    x = 1,256,477.36/1,325.70
  6. Step 6: Final answer
    x = 947.78

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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.