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Finding the Fourth Proportional to 519.36, 715.20 and 487.68

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Solution

The fourth proportional to 519.36, 715.20 and 487.68 is: 671.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.36 : 715.20 = 487.68 : x
  2. Step 2: Convert to fraction form
    519.36/715.20 = 487.68/x
  3. Step 3: Cross multiply
    519.36x = 715.20 × 487.68
  4. Step 4: Simplify right side
    519.36x = 348,788.74
  5. Step 5: Solve for x
    x = 348,788.74/519.36
  6. Step 6: Final answer
    x = 671.57

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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.