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Finding the Fourth Proportional to 1,006.90, 1,509.92 and 390.30

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Solution

The fourth proportional to 1,006.90, 1,509.92 and 390.30 is: 585.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.90 : 1,509.92 = 390.30 : x
  2. Step 2: Convert to fraction form
    1,006.90/1,509.92 = 390.30/x
  3. Step 3: Cross multiply
    1,006.90x = 1,509.92 × 390.30
  4. Step 4: Simplify right side
    1,006.90x = 589,321.78
  5. Step 5: Solve for x
    x = 589,321.78/1,006.90
  6. Step 6: Final answer
    x = 585.28

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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.