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Finding the Fourth Proportional to 970.55, 1,455.47 and 422.60

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Solution

The fourth proportional to 970.55, 1,455.47 and 422.60 is: 633.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.55 : 1,455.47 = 422.60 : x
  2. Step 2: Convert to fraction form
    970.55/1,455.47 = 422.60/x
  3. Step 3: Cross multiply
    970.55x = 1,455.47 × 422.60
  4. Step 4: Simplify right side
    970.55x = 615,072.23
  5. Step 5: Solve for x
    x = 615,072.23/970.55
  6. Step 6: Final answer
    x = 633.74

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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.