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Finding the Fourth Proportional to 1,390.61, 2,085.91 and 416.71

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Solution

The fourth proportional to 1,390.61, 2,085.91 and 416.71 is: 625.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.61 : 2,085.91 = 416.71 : x
  2. Step 2: Convert to fraction form
    1,390.61/2,085.91 = 416.71/x
  3. Step 3: Cross multiply
    1,390.61x = 2,085.91 × 416.71
  4. Step 4: Simplify right side
    1,390.61x = 869,212.61
  5. Step 5: Solve for x
    x = 869,212.61/1,390.61
  6. Step 6: Final answer
    x = 625.06

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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.