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Finding the Fourth Proportional to 1,111.17, 1,666.74 and 643.35

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Solution

The fourth proportional to 1,111.17, 1,666.74 and 643.35 is: 965.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.17 : 1,666.74 = 643.35 : x
  2. Step 2: Convert to fraction form
    1,111.17/1,666.74 = 643.35/x
  3. Step 3: Cross multiply
    1,111.17x = 1,666.74 × 643.35
  4. Step 4: Simplify right side
    1,111.17x = 1,072,297.18
  5. Step 5: Solve for x
    x = 1,072,297.18/1,111.17
  6. Step 6: Final answer
    x = 965.02

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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.