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Finding the Fourth Proportional to 715.08, 986.64 and 515.76

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Solution

The fourth proportional to 715.08, 986.64 and 515.76 is: 711.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.08 : 986.64 = 515.76 : x
  2. Step 2: Convert to fraction form
    715.08/986.64 = 515.76/x
  3. Step 3: Cross multiply
    715.08x = 986.64 × 515.76
  4. Step 4: Simplify right side
    715.08x = 508,869.45
  5. Step 5: Solve for x
    x = 508,869.45/715.08
  6. Step 6: Final answer
    x = 711.63

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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.