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Finding the Fourth Proportional to 971.79, 1,455.85 and 509.48

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Solution

The fourth proportional to 971.79, 1,455.85 and 509.48 is: 763.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.79 : 1,455.85 = 509.48 : x
  2. Step 2: Convert to fraction form
    971.79/1,455.85 = 509.48/x
  3. Step 3: Cross multiply
    971.79x = 1,455.85 × 509.48
  4. Step 4: Simplify right side
    971.79x = 741,726.46
  5. Step 5: Solve for x
    x = 741,726.46/971.79
  6. Step 6: Final answer
    x = 763.26

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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.