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Finding the Fourth Proportional to 665.60, 918.08 and 429.84

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Solution

The fourth proportional to 665.60, 918.08 and 429.84 is: 592.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.60 : 918.08 = 429.84 : x
  2. Step 2: Convert to fraction form
    665.60/918.08 = 429.84/x
  3. Step 3: Cross multiply
    665.60x = 918.08 × 429.84
  4. Step 4: Simplify right side
    665.60x = 394,627.51
  5. Step 5: Solve for x
    x = 394,627.51/665.60
  6. Step 6: Final answer
    x = 592.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.