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Finding the Fourth Proportional to 776.68, 1,165.50 and 290.08

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Solution

The fourth proportional to 776.68, 1,165.50 and 290.08 is: 435.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.68 : 1,165.50 = 290.08 : x
  2. Step 2: Convert to fraction form
    776.68/1,165.50 = 290.08/x
  3. Step 3: Cross multiply
    776.68x = 1,165.50 × 290.08
  4. Step 4: Simplify right side
    776.68x = 338,088.24
  5. Step 5: Solve for x
    x = 338,088.24/776.68
  6. Step 6: Final answer
    x = 435.30

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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.