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Finding the Fourth Proportional to 1,391.84, 2,088.09 and 417.93

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Solution

The fourth proportional to 1,391.84, 2,088.09 and 417.93 is: 626.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.84 : 2,088.09 = 417.93 : x
  2. Step 2: Convert to fraction form
    1,391.84/2,088.09 = 417.93/x
  3. Step 3: Cross multiply
    1,391.84x = 2,088.09 × 417.93
  4. Step 4: Simplify right side
    1,391.84x = 872,675.45
  5. Step 5: Solve for x
    x = 872,675.45/1,391.84
  6. Step 6: Final answer
    x = 626.99

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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.