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Finding the Fourth Proportional to 783.07, 1,175.21 and 393.46

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Solution

The fourth proportional to 783.07, 1,175.21 and 393.46 is: 590.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.07 : 1,175.21 = 393.46 : x
  2. Step 2: Convert to fraction form
    783.07/1,175.21 = 393.46/x
  3. Step 3: Cross multiply
    783.07x = 1,175.21 × 393.46
  4. Step 4: Simplify right side
    783.07x = 462,398.13
  5. Step 5: Solve for x
    x = 462,398.13/783.07
  6. Step 6: Final answer
    x = 590.49

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Double scale
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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.