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Finding the Fourth Proportional to 941.66, 1,300.08 and 643.26

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Solution

The fourth proportional to 941.66, 1,300.08 and 643.26 is: 888.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.66 : 1,300.08 = 643.26 : x
  2. Step 2: Convert to fraction form
    941.66/1,300.08 = 643.26/x
  3. Step 3: Cross multiply
    941.66x = 1,300.08 × 643.26
  4. Step 4: Simplify right side
    941.66x = 836,289.46
  5. Step 5: Solve for x
    x = 836,289.46/941.66
  6. Step 6: Final answer
    x = 888.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.