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Finding the Fourth Proportional to 765.38, 1,054.80 and 706.56

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Solution

The fourth proportional to 765.38, 1,054.80 and 706.56 is: 973.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.38 : 1,054.80 = 706.56 : x
  2. Step 2: Convert to fraction form
    765.38/1,054.80 = 706.56/x
  3. Step 3: Cross multiply
    765.38x = 1,054.80 × 706.56
  4. Step 4: Simplify right side
    765.38x = 745,279.49
  5. Step 5: Solve for x
    x = 745,279.49/765.38
  6. Step 6: Final answer
    x = 973.74

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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.