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Finding the Fourth Proportional to 1,117.50, 1,675.86 and 459.19

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Solution

The fourth proportional to 1,117.50, 1,675.86 and 459.19 is: 688.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.50 : 1,675.86 = 459.19 : x
  2. Step 2: Convert to fraction form
    1,117.50/1,675.86 = 459.19/x
  3. Step 3: Cross multiply
    1,117.50x = 1,675.86 × 459.19
  4. Step 4: Simplify right side
    1,117.50x = 769,529.77
  5. Step 5: Solve for x
    x = 769,529.77/1,117.50
  6. Step 6: Final answer
    x = 688.62

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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.