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Finding the Fourth Proportional to 1,005.17, 1,508.01 and 388.71

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Solution

The fourth proportional to 1,005.17, 1,508.01 and 388.71 is: 583.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.17 : 1,508.01 = 388.71 : x
  2. Step 2: Convert to fraction form
    1,005.17/1,508.01 = 388.71/x
  3. Step 3: Cross multiply
    1,005.17x = 1,508.01 × 388.71
  4. Step 4: Simplify right side
    1,005.17x = 586,178.57
  5. Step 5: Solve for x
    x = 586,178.57/1,005.17
  6. Step 6: Final answer
    x = 583.16

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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.