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Finding the Fourth Proportional to 1,111.13, 1,666.64 and 289.35

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Solution

The fourth proportional to 1,111.13, 1,666.64 and 289.35 is: 434.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.13 : 1,666.64 = 289.35 : x
  2. Step 2: Convert to fraction form
    1,111.13/1,666.64 = 289.35/x
  3. Step 3: Cross multiply
    1,111.13x = 1,666.64 × 289.35
  4. Step 4: Simplify right side
    1,111.13x = 482,242.28
  5. Step 5: Solve for x
    x = 482,242.28/1,111.13
  6. Step 6: Final answer
    x = 434.01

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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.