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Finding the Fourth Proportional to 926.79, 1,278.99 and 507.15

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Solution

The fourth proportional to 926.79, 1,278.99 and 507.15 is: 699.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.79 : 1,278.99 = 507.15 : x
  2. Step 2: Convert to fraction form
    926.79/1,278.99 = 507.15/x
  3. Step 3: Cross multiply
    926.79x = 1,278.99 × 507.15
  4. Step 4: Simplify right side
    926.79x = 648,639.78
  5. Step 5: Solve for x
    x = 648,639.78/926.79
  6. Step 6: Final answer
    x = 699.88

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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.