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Finding the Fourth Proportional to 917.85, 1,377.24 and 430.83

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Solution

The fourth proportional to 917.85, 1,377.24 and 430.83 is: 646.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.85 : 1,377.24 = 430.83 : x
  2. Step 2: Convert to fraction form
    917.85/1,377.24 = 430.83/x
  3. Step 3: Cross multiply
    917.85x = 1,377.24 × 430.83
  4. Step 4: Simplify right side
    917.85x = 593,356.31
  5. Step 5: Solve for x
    x = 593,356.31/917.85
  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.