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Finding the Fourth Proportional to 1,063.80, 1,468.38 and 621.72

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Solution

The fourth proportional to 1,063.80, 1,468.38 and 621.72 is: 858.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,063.80 : 1,468.38 = 621.72 : x
  2. Step 2: Convert to fraction form
    1,063.80/1,468.38 = 621.72/x
  3. Step 3: Cross multiply
    1,063.80x = 1,468.38 × 621.72
  4. Step 4: Simplify right side
    1,063.80x = 912,921.21
  5. Step 5: Solve for x
    x = 912,921.21/1,063.80
  6. Step 6: Final answer
    x = 858.17

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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.