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Finding the Fourth Proportional to 774.61, 1,068.71 and 442.91

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Solution

The fourth proportional to 774.61, 1,068.71 and 442.91 is: 611.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.61 : 1,068.71 = 442.91 : x
  2. Step 2: Convert to fraction form
    774.61/1,068.71 = 442.91/x
  3. Step 3: Cross multiply
    774.61x = 1,068.71 × 442.91
  4. Step 4: Simplify right side
    774.61x = 473,342.80
  5. Step 5: Solve for x
    x = 473,342.80/774.61
  6. Step 6: Final answer
    x = 611.07

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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.