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Finding the Fourth Proportional to 973.34, 1,343.75 and 642.55

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Solution

The fourth proportional to 973.34, 1,343.75 and 642.55 is: 887.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.34 : 1,343.75 = 642.55 : x
  2. Step 2: Convert to fraction form
    973.34/1,343.75 = 642.55/x
  3. Step 3: Cross multiply
    973.34x = 1,343.75 × 642.55
  4. Step 4: Simplify right side
    973.34x = 863,426.56
  5. Step 5: Solve for x
    x = 863,426.56/973.34
  6. Step 6: Final answer
    x = 887.08

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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.