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Finding the Fourth Proportional to 776.61, 1,071.68 and 461.90

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Solution

The fourth proportional to 776.61, 1,071.68 and 461.90 is: 637.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.61 : 1,071.68 = 461.90 : x
  2. Step 2: Convert to fraction form
    776.61/1,071.68 = 461.90/x
  3. Step 3: Cross multiply
    776.61x = 1,071.68 × 461.90
  4. Step 4: Simplify right side
    776.61x = 495,008.99
  5. Step 5: Solve for x
    x = 495,008.99/776.61
  6. Step 6: Final answer
    x = 637.40

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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.