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Finding the Fourth Proportional to 1,285.79, 1,929.87 and 669.93

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Solution

The fourth proportional to 1,285.79, 1,929.87 and 669.93 is: 1,005.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.79 : 1,929.87 = 669.93 : x
  2. Step 2: Convert to fraction form
    1,285.79/1,929.87 = 669.93/x
  3. Step 3: Cross multiply
    1,285.79x = 1,929.87 × 669.93
  4. Step 4: Simplify right side
    1,285.79x = 1,292,877.81
  5. Step 5: Solve for x
    x = 1,292,877.81/1,285.79
  6. Step 6: Final answer
    x = 1,005.52

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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.