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Finding the Fourth Proportional to 873.72, 1,309.14 and 643.08

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Solution

The fourth proportional to 873.72, 1,309.14 and 643.08 is: 963.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.72 : 1,309.14 = 643.08 : x
  2. Step 2: Convert to fraction form
    873.72/1,309.14 = 643.08/x
  3. Step 3: Cross multiply
    873.72x = 1,309.14 × 643.08
  4. Step 4: Simplify right side
    873.72x = 841,881.75
  5. Step 5: Solve for x
    x = 841,881.75/873.72
  6. Step 6: Final answer
    x = 963.56

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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.