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Finding the Fourth Proportional to 763.34, 1,056.18 and 665.30

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Solution

The fourth proportional to 763.34, 1,056.18 and 665.30 is: 920.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.34 : 1,056.18 = 665.30 : x
  2. Step 2: Convert to fraction form
    763.34/1,056.18 = 665.30/x
  3. Step 3: Cross multiply
    763.34x = 1,056.18 × 665.30
  4. Step 4: Simplify right side
    763.34x = 702,671.27
  5. Step 5: Solve for x
    x = 702,671.27/763.34
  6. Step 6: Final answer
    x = 920.53

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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.