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Finding the Fourth Proportional to 917.80, 1,374.30 and 591.40

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Solution

The fourth proportional to 917.80, 1,374.30 and 591.40 is: 885.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.80 : 1,374.30 = 591.40 : x
  2. Step 2: Convert to fraction form
    917.80/1,374.30 = 591.40/x
  3. Step 3: Cross multiply
    917.80x = 1,374.30 × 591.40
  4. Step 4: Simplify right side
    917.80x = 812,761.02
  5. Step 5: Solve for x
    x = 812,761.02/917.80
  6. Step 6: Final answer
    x = 885.55

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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.