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Finding the Fourth Proportional to 783.19, 1,173.33 and 392.74

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Solution

The fourth proportional to 783.19, 1,173.33 and 392.74 is: 588.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.19 : 1,173.33 = 392.74 : x
  2. Step 2: Convert to fraction form
    783.19/1,173.33 = 392.74/x
  3. Step 3: Cross multiply
    783.19x = 1,173.33 × 392.74
  4. Step 4: Simplify right side
    783.19x = 460,813.62
  5. Step 5: Solve for x
    x = 460,813.62/783.19
  6. Step 6: Final answer
    x = 588.38

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1.5x scale

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.