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Finding the Fourth Proportional to 312.61, 469.23 and 290.74

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Solution

The fourth proportional to 312.61, 469.23 and 290.74 is: 436.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.61 : 469.23 = 290.74 : x
  2. Step 2: Convert to fraction form
    312.61/469.23 = 290.74/x
  3. Step 3: Cross multiply
    312.61x = 469.23 × 290.74
  4. Step 4: Simplify right side
    312.61x = 136,423.93
  5. Step 5: Solve for x
    x = 136,423.93/312.61
  6. Step 6: Final answer
    x = 436.40

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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.