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Finding the Fourth Proportional to 1,275.15, 1,911.99 and 616.80

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Solution

The fourth proportional to 1,275.15, 1,911.99 and 616.80 is: 924.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.15 : 1,911.99 = 616.80 : x
  2. Step 2: Convert to fraction form
    1,275.15/1,911.99 = 616.80/x
  3. Step 3: Cross multiply
    1,275.15x = 1,911.99 × 616.80
  4. Step 4: Simplify right side
    1,275.15x = 1,179,315.43
  5. Step 5: Solve for x
    x = 1,179,315.43/1,275.15
  6. Step 6: Final answer
    x = 924.84

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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.