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Finding the Fourth Proportional to 971.79, 1,458.49 and 510.90

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Solution

The fourth proportional to 971.79, 1,458.49 and 510.90 is: 766.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.79 : 1,458.49 = 510.90 : x
  2. Step 2: Convert to fraction form
    971.79/1,458.49 = 510.90/x
  3. Step 3: Cross multiply
    971.79x = 1,458.49 × 510.90
  4. Step 4: Simplify right side
    971.79x = 745,142.54
  5. Step 5: Solve for x
    x = 745,142.54/971.79
  6. Step 6: Final answer
    x = 766.77

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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.