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Finding the Fourth Proportional to 971.91, 1,458.10 and 278.60

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Solution

The fourth proportional to 971.91, 1,458.10 and 278.60 is: 417.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.91 : 1,458.10 = 278.60 : x
  2. Step 2: Convert to fraction form
    971.91/1,458.10 = 278.60/x
  3. Step 3: Cross multiply
    971.91x = 1,458.10 × 278.60
  4. Step 4: Simplify right side
    971.91x = 406,219.72
  5. Step 5: Solve for x
    x = 406,219.72/971.91
  6. Step 6: Final answer
    x = 417.96

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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.