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Finding the Fourth Proportional to 763.32, 1,051.86 and 688.80

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Solution

The fourth proportional to 763.32, 1,051.86 and 688.80 is: 949.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.32 : 1,051.86 = 688.80 : x
  2. Step 2: Convert to fraction form
    763.32/1,051.86 = 688.80/x
  3. Step 3: Cross multiply
    763.32x = 1,051.86 × 688.80
  4. Step 4: Simplify right side
    763.32x = 724,521.17
  5. Step 5: Solve for x
    x = 724,521.17/763.32
  6. Step 6: Final answer
    x = 949.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.