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Finding the Fourth Proportional to 929.86, 1,395.81 and 540.30

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Solution

The fourth proportional to 929.86, 1,395.81 and 540.30 is: 811.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.86 : 1,395.81 = 540.30 : x
  2. Step 2: Convert to fraction form
    929.86/1,395.81 = 540.30/x
  3. Step 3: Cross multiply
    929.86x = 1,395.81 × 540.30
  4. Step 4: Simplify right side
    929.86x = 754,159.98
  5. Step 5: Solve for x
    x = 754,159.98/929.86
  6. Step 6: Final answer
    x = 811.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.