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Finding the Fourth Proportional to 926.68, 1,278.80 and 507.02

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Solution

The fourth proportional to 926.68, 1,278.80 and 507.02 is: 699.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.68 : 1,278.80 = 507.02 : x
  2. Step 2: Convert to fraction form
    926.68/1,278.80 = 507.02/x
  3. Step 3: Cross multiply
    926.68x = 1,278.80 × 507.02
  4. Step 4: Simplify right side
    926.68x = 648,377.18
  5. Step 5: Solve for x
    x = 648,377.18/926.68
  6. Step 6: Final answer
    x = 699.68

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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.