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Finding the Fourth Proportional to 763.66, 1,143.06 and 647.02

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Solution

The fourth proportional to 763.66, 1,143.06 and 647.02 is: 968.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.66 : 1,143.06 = 647.02 : x
  2. Step 2: Convert to fraction form
    763.66/1,143.06 = 647.02/x
  3. Step 3: Cross multiply
    763.66x = 1,143.06 × 647.02
  4. Step 4: Simplify right side
    763.66x = 739,582.68
  5. Step 5: Solve for x
    x = 739,582.68/763.66
  6. Step 6: Final answer
    x = 968.47

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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.