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Finding the Fourth Proportional to 880.63, 1,320.95 and 515.17

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Solution

The fourth proportional to 880.63, 1,320.95 and 515.17 is: 772.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.63 : 1,320.95 = 515.17 : x
  2. Step 2: Convert to fraction form
    880.63/1,320.95 = 515.17/x
  3. Step 3: Cross multiply
    880.63x = 1,320.95 × 515.17
  4. Step 4: Simplify right side
    880.63x = 680,513.81
  5. Step 5: Solve for x
    x = 680,513.81/880.63
  6. Step 6: Final answer
    x = 772.76

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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.