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Finding the Fourth Proportional to 518.40, 715.64 and 371.12

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Solution

The fourth proportional to 518.40, 715.64 and 371.12 is: 512.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.40 : 715.64 = 371.12 : x
  2. Step 2: Convert to fraction form
    518.40/715.64 = 371.12/x
  3. Step 3: Cross multiply
    518.40x = 715.64 × 371.12
  4. Step 4: Simplify right side
    518.40x = 265,582.88
  5. Step 5: Solve for x
    x = 265,582.88/518.40
  6. Step 6: Final answer
    x = 512.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.