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Finding the Fourth Proportional to 940.64, 1,409.88 and 632.12

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Solution

The fourth proportional to 940.64, 1,409.88 and 632.12 is: 947.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.64 : 1,409.88 = 632.12 : x
  2. Step 2: Convert to fraction form
    940.64/1,409.88 = 632.12/x
  3. Step 3: Cross multiply
    940.64x = 1,409.88 × 632.12
  4. Step 4: Simplify right side
    940.64x = 891,213.35
  5. Step 5: Solve for x
    x = 891,213.35/940.64
  6. Step 6: Final answer
    x = 947.45

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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.