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Finding the Fourth Proportional to 1,006.31, 1,509.90 and 390.46

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Solution

The fourth proportional to 1,006.31, 1,509.90 and 390.46 is: 585.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.31 : 1,509.90 = 390.46 : x
  2. Step 2: Convert to fraction form
    1,006.31/1,509.90 = 390.46/x
  3. Step 3: Cross multiply
    1,006.31x = 1,509.90 × 390.46
  4. Step 4: Simplify right side
    1,006.31x = 589,548.00
  5. Step 5: Solve for x
    x = 589,548.00/1,006.31
  6. Step 6: Final answer
    x = 585.85

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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.