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Finding the Fourth Proportional to 765.40, 1,054.38 and 609.88

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Solution

The fourth proportional to 765.40, 1,054.38 and 609.88 is: 840.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.40 : 1,054.38 = 609.88 : x
  2. Step 2: Convert to fraction form
    765.40/1,054.38 = 609.88/x
  3. Step 3: Cross multiply
    765.40x = 1,054.38 × 609.88
  4. Step 4: Simplify right side
    765.40x = 643,045.27
  5. Step 5: Solve for x
    x = 643,045.27/765.40
  6. Step 6: Final answer
    x = 840.14

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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.