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Finding the Fourth Proportional to 1,170.70, 1,756.25 and 390.80

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Solution

The fourth proportional to 1,170.70, 1,756.25 and 390.80 is: 586.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.70 : 1,756.25 = 390.80 : x
  2. Step 2: Convert to fraction form
    1,170.70/1,756.25 = 390.80/x
  3. Step 3: Cross multiply
    1,170.70x = 1,756.25 × 390.80
  4. Step 4: Simplify right side
    1,170.70x = 686,342.50
  5. Step 5: Solve for x
    x = 686,342.50/1,170.70
  6. Step 6: Final answer
    x = 586.27

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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.