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Finding the Fourth Proportional to 780.03, 1,170.13 and 317.74

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Solution

The fourth proportional to 780.03, 1,170.13 and 317.74 is: 476.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.03 : 1,170.13 = 317.74 : x
  2. Step 2: Convert to fraction form
    780.03/1,170.13 = 317.74/x
  3. Step 3: Cross multiply
    780.03x = 1,170.13 × 317.74
  4. Step 4: Simplify right side
    780.03x = 371,797.11
  5. Step 5: Solve for x
    x = 371,797.11/780.03
  6. Step 6: Final answer
    x = 476.64

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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.