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Finding the Fourth Proportional to 1,053.44, 1,583.04 and 643.76

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Solution

The fourth proportional to 1,053.44, 1,583.04 and 643.76 is: 967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.44 : 1,583.04 = 643.76 : x
  2. Step 2: Convert to fraction form
    1,053.44/1,583.04 = 643.76/x
  3. Step 3: Cross multiply
    1,053.44x = 1,583.04 × 643.76
  4. Step 4: Simplify right side
    1,053.44x = 1,019,097.83
  5. Step 5: Solve for x
    x = 1,019,097.83/1,053.44
  6. Step 6: Final answer
    x = 967.40

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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.