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Finding the Fourth Proportional to 387.60, 579.06 and 291.60

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Solution

The fourth proportional to 387.60, 579.06 and 291.60 is: 435.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.60 : 579.06 = 291.60 : x
  2. Step 2: Convert to fraction form
    387.60/579.06 = 291.60/x
  3. Step 3: Cross multiply
    387.60x = 579.06 × 291.60
  4. Step 4: Simplify right side
    387.60x = 168,853.90
  5. Step 5: Solve for x
    x = 168,853.90/387.60
  6. Step 6: Final answer
    x = 435.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.