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Finding the Fourth Proportional to 1,054.24, 1,577.28 and 643.36

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Solution

The fourth proportional to 1,054.24, 1,577.28 and 643.36 is: 962.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,054.24 : 1,577.28 = 643.36 : x
  2. Step 2: Convert to fraction form
    1,054.24/1,577.28 = 643.36/x
  3. Step 3: Cross multiply
    1,054.24x = 1,577.28 × 643.36
  4. Step 4: Simplify right side
    1,054.24x = 1,014,758.86
  5. Step 5: Solve for x
    x = 1,014,758.86/1,054.24
  6. Step 6: Final answer
    x = 962.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.