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Finding the Fourth Proportional to 1,007.60, 1,511.80 and 391.28

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Solution

The fourth proportional to 1,007.60, 1,511.80 and 391.28 is: 587.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.60 : 1,511.80 = 391.28 : x
  2. Step 2: Convert to fraction form
    1,007.60/1,511.80 = 391.28/x
  3. Step 3: Cross multiply
    1,007.60x = 1,511.80 × 391.28
  4. Step 4: Simplify right side
    1,007.60x = 591,537.10
  5. Step 5: Solve for x
    x = 591,537.10/1,007.60
  6. Step 6: Final answer
    x = 587.08

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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.