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Finding the Fourth Proportional to 1,111.21, 1,666.51 and 417.65

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Solution

The fourth proportional to 1,111.21, 1,666.51 and 417.65 is: 626.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.21 : 1,666.51 = 417.65 : x
  2. Step 2: Convert to fraction form
    1,111.21/1,666.51 = 417.65/x
  3. Step 3: Cross multiply
    1,111.21x = 1,666.51 × 417.65
  4. Step 4: Simplify right side
    1,111.21x = 696,008.52
  5. Step 5: Solve for x
    x = 696,008.52/1,111.21
  6. Step 6: Final answer
    x = 626.35

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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.