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Finding the Fourth Proportional to 1,292.60, 1,784.25 and 768.63

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Solution

The fourth proportional to 1,292.60, 1,784.25 and 768.63 is: 1,060.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.60 : 1,784.25 = 768.63 : x
  2. Step 2: Convert to fraction form
    1,292.60/1,784.25 = 768.63/x
  3. Step 3: Cross multiply
    1,292.60x = 1,784.25 × 768.63
  4. Step 4: Simplify right side
    1,292.60x = 1,371,428.08
  5. Step 5: Solve for x
    x = 1,371,428.08/1,292.60
  6. Step 6: Final answer
    x = 1,060.98

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1.5x scale

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.