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Finding the Fourth Proportional to 917.60, 1,377 and 430.79

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Solution

The fourth proportional to 917.60, 1,377 and 430.79 is: 646.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.60 : 1,377 = 430.79 : x
  2. Step 2: Convert to fraction form
    917.60/1,377 = 430.79/x
  3. Step 3: Cross multiply
    917.60x = 1,377 × 430.79
  4. Step 4: Simplify right side
    917.60x = 593,190.95
  5. Step 5: Solve for x
    x = 593,190.95/917.60
  6. Step 6: Final answer
    x = 646.46

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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.