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Finding the Fourth Proportional to 1,207.79, 1,810.59 and 438.11

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Solution

The fourth proportional to 1,207.79, 1,810.59 and 438.11 is: 656.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.79 : 1,810.59 = 438.11 : x
  2. Step 2: Convert to fraction form
    1,207.79/1,810.59 = 438.11/x
  3. Step 3: Cross multiply
    1,207.79x = 1,810.59 × 438.11
  4. Step 4: Simplify right side
    1,207.79x = 793,237.58
  5. Step 5: Solve for x
    x = 793,237.58/1,207.79
  6. Step 6: Final answer
    x = 656.77

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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.