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Finding the Fourth Proportional to 971.60, 1,455.32 and 712.05

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Solution

The fourth proportional to 971.60, 1,455.32 and 712.05 is: 1,066.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.60 : 1,455.32 = 712.05 : x
  2. Step 2: Convert to fraction form
    971.60/1,455.32 = 712.05/x
  3. Step 3: Cross multiply
    971.60x = 1,455.32 × 712.05
  4. Step 4: Simplify right side
    971.60x = 1,036,257.05
  5. Step 5: Solve for x
    x = 1,036,257.05/971.60
  6. Step 6: Final answer
    x = 1,066.55

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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.