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Finding the Fourth Proportional to 971.94, 1,457.64 and 278.58

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Solution

The fourth proportional to 971.94, 1,457.64 and 278.58 is: 417.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.94 : 1,457.64 = 278.58 : x
  2. Step 2: Convert to fraction form
    971.94/1,457.64 = 278.58/x
  3. Step 3: Cross multiply
    971.94x = 1,457.64 × 278.58
  4. Step 4: Simplify right side
    971.94x = 406,069.35
  5. Step 5: Solve for x
    x = 406,069.35/971.94
  6. Step 6: Final answer
    x = 417.79

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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.