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Finding the Fourth Proportional to 1,386.30, 2,078.72 and 461.76

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Solution

The fourth proportional to 1,386.30, 2,078.72 and 461.76 is: 692.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.30 : 2,078.72 = 461.76 : x
  2. Step 2: Convert to fraction form
    1,386.30/2,078.72 = 461.76/x
  3. Step 3: Cross multiply
    1,386.30x = 2,078.72 × 461.76
  4. Step 4: Simplify right side
    1,386.30x = 959,869.75
  5. Step 5: Solve for x
    x = 959,869.75/1,386.30
  6. Step 6: Final answer
    x = 692.40

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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.