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Finding the Fourth Proportional to 1,275.63, 1,911.74 and 780.53

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Solution

The fourth proportional to 1,275.63, 1,911.74 and 780.53 is: 1,169.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.63 : 1,911.74 = 780.53 : x
  2. Step 2: Convert to fraction form
    1,275.63/1,911.74 = 780.53/x
  3. Step 3: Cross multiply
    1,275.63x = 1,911.74 × 780.53
  4. Step 4: Simplify right side
    1,275.63x = 1,492,156.96
  5. Step 5: Solve for x
    x = 1,492,156.96/1,275.63
  6. Step 6: Final answer
    x = 1,169.74

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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.