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Finding the Fourth Proportional to 717.09, 1,075.65 and 391.77

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Solution

The fourth proportional to 717.09, 1,075.65 and 391.77 is: 587.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.09 : 1,075.65 = 391.77 : x
  2. Step 2: Convert to fraction form
    717.09/1,075.65 = 391.77/x
  3. Step 3: Cross multiply
    717.09x = 1,075.65 × 391.77
  4. Step 4: Simplify right side
    717.09x = 421,407.40
  5. Step 5: Solve for x
    x = 421,407.40/717.09
  6. Step 6: Final answer
    x = 587.66

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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.