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Finding the Fourth Proportional to 972.87, 1,341.18 and 839.49

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Solution

The fourth proportional to 972.87, 1,341.18 and 839.49 is: 1,157.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.87 : 1,341.18 = 839.49 : x
  2. Step 2: Convert to fraction form
    972.87/1,341.18 = 839.49/x
  3. Step 3: Cross multiply
    972.87x = 1,341.18 × 839.49
  4. Step 4: Simplify right side
    972.87x = 1,125,907.20
  5. Step 5: Solve for x
    x = 1,125,907.20/972.87
  6. Step 6: Final answer
    x = 1,157.30

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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.