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Finding the Fourth Proportional to 970.20, 1,338.44 and 646.89

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Solution

The fourth proportional to 970.20, 1,338.44 and 646.89 is: 892.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.20 : 1,338.44 = 646.89 : x
  2. Step 2: Convert to fraction form
    970.20/1,338.44 = 646.89/x
  3. Step 3: Cross multiply
    970.20x = 1,338.44 × 646.89
  4. Step 4: Simplify right side
    970.20x = 865,828.41
  5. Step 5: Solve for x
    x = 865,828.41/970.20
  6. Step 6: Final answer
    x = 892.42

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1.5x scale

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.