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Finding the Fourth Proportional to 1,019.69, 1,529.72 and 386.45

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Solution

The fourth proportional to 1,019.69, 1,529.72 and 386.45 is: 579.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.69 : 1,529.72 = 386.45 : x
  2. Step 2: Convert to fraction form
    1,019.69/1,529.72 = 386.45/x
  3. Step 3: Cross multiply
    1,019.69x = 1,529.72 × 386.45
  4. Step 4: Simplify right side
    1,019.69x = 591,150.71
  5. Step 5: Solve for x
    x = 591,150.71/1,019.69
  6. Step 6: Final answer
    x = 579.74

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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.