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Finding the Fourth Proportional to 405.48, 560.88 and 339.78

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Solution

The fourth proportional to 405.48, 560.88 and 339.78 is: 470.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.48 : 560.88 = 339.78 : x
  2. Step 2: Convert to fraction form
    405.48/560.88 = 339.78/x
  3. Step 3: Cross multiply
    405.48x = 560.88 × 339.78
  4. Step 4: Simplify right side
    405.48x = 190,575.81
  5. Step 5: Solve for x
    x = 190,575.81/405.48
  6. Step 6: Final answer
    x = 470.00

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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.