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Finding the Fourth Proportional to 929.65, 1,282.86 and 509.92

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Solution

The fourth proportional to 929.65, 1,282.86 and 509.92 is: 703.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.65 : 1,282.86 = 509.92 : x
  2. Step 2: Convert to fraction form
    929.65/1,282.86 = 509.92/x
  3. Step 3: Cross multiply
    929.65x = 1,282.86 × 509.92
  4. Step 4: Simplify right side
    929.65x = 654,155.97
  5. Step 5: Solve for x
    x = 654,155.97/929.65
  6. Step 6: Final answer
    x = 703.66

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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.