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Finding the Fourth Proportional to 910.42, 1,364.74 and 390.55

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Solution

The fourth proportional to 910.42, 1,364.74 and 390.55 is: 585.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.42 : 1,364.74 = 390.55 : x
  2. Step 2: Convert to fraction form
    910.42/1,364.74 = 390.55/x
  3. Step 3: Cross multiply
    910.42x = 1,364.74 × 390.55
  4. Step 4: Simplify right side
    910.42x = 532,999.21
  5. Step 5: Solve for x
    x = 532,999.21/910.42
  6. Step 6: Final answer
    x = 585.44

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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.