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Finding the Fourth Proportional to 929.39, 1,282.51 and 509.74

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Solution

The fourth proportional to 929.39, 1,282.51 and 509.74 is: 703.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.39 : 1,282.51 = 509.74 : x
  2. Step 2: Convert to fraction form
    929.39/1,282.51 = 509.74/x
  3. Step 3: Cross multiply
    929.39x = 1,282.51 × 509.74
  4. Step 4: Simplify right side
    929.39x = 653,746.65
  5. Step 5: Solve for x
    x = 653,746.65/929.39
  6. Step 6: Final answer
    x = 703.41

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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.