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Finding the Fourth Proportional to 774.39, 1,068.76 and 438.36

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Solution

The fourth proportional to 774.39, 1,068.76 and 438.36 is: 604.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.39 : 1,068.76 = 438.36 : x
  2. Step 2: Convert to fraction form
    774.39/1,068.76 = 438.36/x
  3. Step 3: Cross multiply
    774.39x = 1,068.76 × 438.36
  4. Step 4: Simplify right side
    774.39x = 468,501.63
  5. Step 5: Solve for x
    x = 468,501.63/774.39
  6. Step 6: Final answer
    x = 604.99

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Double scale
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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.