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Finding the Fourth Proportional to 645.84, 887.76 and 578.88

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Solution

The fourth proportional to 645.84, 887.76 and 578.88 is: 795.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.84 : 887.76 = 578.88 : x
  2. Step 2: Convert to fraction form
    645.84/887.76 = 578.88/x
  3. Step 3: Cross multiply
    645.84x = 887.76 × 578.88
  4. Step 4: Simplify right side
    645.84x = 513,906.51
  5. Step 5: Solve for x
    x = 513,906.51/645.84
  6. Step 6: Final answer
    x = 795.72

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.