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Finding the Fourth Proportional to 972.80, 1,459.20 and 889.60

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Solution

The fourth proportional to 972.80, 1,459.20 and 889.60 is: 1,334.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.80 : 1,459.20 = 889.60 : x
  2. Step 2: Convert to fraction form
    972.80/1,459.20 = 889.60/x
  3. Step 3: Cross multiply
    972.80x = 1,459.20 × 889.60
  4. Step 4: Simplify right side
    972.80x = 1,298,104.32
  5. Step 5: Solve for x
    x = 1,298,104.32/972.80
  6. Step 6: Final answer
    x = 1,334.40

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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.