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Finding the Fourth Proportional to 774.25, 1,068.47 and 420.18

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Solution

The fourth proportional to 774.25, 1,068.47 and 420.18 is: 579.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.25 : 1,068.47 = 420.18 : x
  2. Step 2: Convert to fraction form
    774.25/1,068.47 = 420.18/x
  3. Step 3: Cross multiply
    774.25x = 1,068.47 × 420.18
  4. Step 4: Simplify right side
    774.25x = 448,944.38
  5. Step 5: Solve for x
    x = 448,944.38/774.25
  6. Step 6: Final answer
    x = 579.84

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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.