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Finding the Fourth Proportional to 1,007.84, 1,511.36 and 430.31

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Solution

The fourth proportional to 1,007.84, 1,511.36 and 430.31 is: 645.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.84 : 1,511.36 = 430.31 : x
  2. Step 2: Convert to fraction form
    1,007.84/1,511.36 = 430.31/x
  3. Step 3: Cross multiply
    1,007.84x = 1,511.36 × 430.31
  4. Step 4: Simplify right side
    1,007.84x = 650,356.56
  5. Step 5: Solve for x
    x = 650,356.56/1,007.84
  6. Step 6: Final answer
    x = 645.30

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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.