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Finding the Fourth Proportional to 929.48, 1,386.69 and 859.76

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Solution

The fourth proportional to 929.48, 1,386.69 and 859.76 is: 1,282.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.48 : 1,386.69 = 859.76 : x
  2. Step 2: Convert to fraction form
    929.48/1,386.69 = 859.76/x
  3. Step 3: Cross multiply
    929.48x = 1,386.69 × 859.76
  4. Step 4: Simplify right side
    929.48x = 1,192,230.69
  5. Step 5: Solve for x
    x = 1,192,230.69/929.48
  6. Step 6: Final answer
    x = 1,282.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.