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Finding the Fourth Proportional to 1,006.48, 1,509.81 and 390.70

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Solution

The fourth proportional to 1,006.48, 1,509.81 and 390.70 is: 586.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.48 : 1,509.81 = 390.70 : x
  2. Step 2: Convert to fraction form
    1,006.48/1,509.81 = 390.70/x
  3. Step 3: Cross multiply
    1,006.48x = 1,509.81 × 390.70
  4. Step 4: Simplify right side
    1,006.48x = 589,882.77
  5. Step 5: Solve for x
    x = 589,882.77/1,006.48
  6. Step 6: Final answer
    x = 586.08

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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.