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Finding the Fourth Proportional to 1,307.88, 1,961.55 and 760.86

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Solution

The fourth proportional to 1,307.88, 1,961.55 and 760.86 is: 1,141.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.88 : 1,961.55 = 760.86 : x
  2. Step 2: Convert to fraction form
    1,307.88/1,961.55 = 760.86/x
  3. Step 3: Cross multiply
    1,307.88x = 1,961.55 × 760.86
  4. Step 4: Simplify right side
    1,307.88x = 1,492,464.93
  5. Step 5: Solve for x
    x = 1,492,464.93/1,307.88
  6. Step 6: Final answer
    x = 1,141.13

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1.5x scale

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.