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Finding the Fourth Proportional to 1,239.25, 1,710.17 and 774.13

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Solution

The fourth proportional to 1,239.25, 1,710.17 and 774.13 is: 1,068.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.25 : 1,710.17 = 774.13 : x
  2. Step 2: Convert to fraction form
    1,239.25/1,710.17 = 774.13/x
  3. Step 3: Cross multiply
    1,239.25x = 1,710.17 × 774.13
  4. Step 4: Simplify right side
    1,239.25x = 1,323,893.90
  5. Step 5: Solve for x
    x = 1,323,893.90/1,239.25
  6. Step 6: Final answer
    x = 1,068.30

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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.