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Finding the Fourth Proportional to 971.92, 1,457.30 and 387.00

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Solution

The fourth proportional to 971.92, 1,457.30 and 387.00 is: 580.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.92 : 1,457.30 = 387.00 : x
  2. Step 2: Convert to fraction form
    971.92/1,457.30 = 387.00/x
  3. Step 3: Cross multiply
    971.92x = 1,457.30 × 387.00
  4. Step 4: Simplify right side
    971.92x = 563,965.88
  5. Step 5: Solve for x
    x = 563,965.88/971.92
  6. Step 6: Final answer
    x = 580.26

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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.