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Finding the Fourth Proportional to 971.21, 1,457.65 and 509.31

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Solution

The fourth proportional to 971.21, 1,457.65 and 509.31 is: 764.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.21 : 1,457.65 = 509.31 : x
  2. Step 2: Convert to fraction form
    971.21/1,457.65 = 509.31/x
  3. Step 3: Cross multiply
    971.21x = 1,457.65 × 509.31
  4. Step 4: Simplify right side
    971.21x = 742,395.72
  5. Step 5: Solve for x
    x = 742,395.72/971.21
  6. Step 6: Final answer
    x = 764.40

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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.