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Finding the Fourth Proportional to 929.55, 1,282.79 and 509.91

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Solution

The fourth proportional to 929.55, 1,282.79 and 509.91 is: 703.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.55 : 1,282.79 = 509.91 : x
  2. Step 2: Convert to fraction form
    929.55/1,282.79 = 509.91/x
  3. Step 3: Cross multiply
    929.55x = 1,282.79 × 509.91
  4. Step 4: Simplify right side
    929.55x = 654,107.45
  5. Step 5: Solve for x
    x = 654,107.45/929.55
  6. Step 6: Final answer
    x = 703.68

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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.