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Finding the Fourth Proportional to 970.96, 1,340.40 and 662.08

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Solution

The fourth proportional to 970.96, 1,340.40 and 662.08 is: 913.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.96 : 1,340.40 = 662.08 : x
  2. Step 2: Convert to fraction form
    970.96/1,340.40 = 662.08/x
  3. Step 3: Cross multiply
    970.96x = 1,340.40 × 662.08
  4. Step 4: Simplify right side
    970.96x = 887,452.03
  5. Step 5: Solve for x
    x = 887,452.03/970.96
  6. Step 6: Final answer
    x = 913.99

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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.