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Finding the Fourth Proportional to 623.84, 939.47 and 543.65

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Solution

The fourth proportional to 623.84, 939.47 and 543.65 is: 818.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.84 : 939.47 = 543.65 : x
  2. Step 2: Convert to fraction form
    623.84/939.47 = 543.65/x
  3. Step 3: Cross multiply
    623.84x = 939.47 × 543.65
  4. Step 4: Simplify right side
    623.84x = 510,735.45
  5. Step 5: Solve for x
    x = 510,735.45/623.84
  6. Step 6: Final answer
    x = 818.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.