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Finding the Fourth Proportional to 921.76, 1,272.02 and 507.76

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Solution

The fourth proportional to 921.76, 1,272.02 and 507.76 is: 700.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.76 : 1,272.02 = 507.76 : x
  2. Step 2: Convert to fraction form
    921.76/1,272.02 = 507.76/x
  3. Step 3: Cross multiply
    921.76x = 1,272.02 × 507.76
  4. Step 4: Simplify right side
    921.76x = 645,880.88
  5. Step 5: Solve for x
    x = 645,880.88/921.76
  6. Step 6: Final answer
    x = 700.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.