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Finding the Fourth Proportional to 1,712.10, 2,567.80 and 479.20

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Solution

The fourth proportional to 1,712.10, 2,567.80 and 479.20 is: 718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,712.10 : 2,567.80 = 479.20 : x
  2. Step 2: Convert to fraction form
    1,712.10/2,567.80 = 479.20/x
  3. Step 3: Cross multiply
    1,712.10x = 2,567.80 × 479.20
  4. Step 4: Simplify right side
    1,712.10x = 1,230,489.76
  5. Step 5: Solve for x
    x = 1,230,489.76/1,712.10
  6. Step 6: Final answer
    x = 718.70

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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.