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Finding the Fourth Proportional to 1,289.49, 1,779.38 and 729.93

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Solution

The fourth proportional to 1,289.49, 1,779.38 and 729.93 is: 1,007.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.49 : 1,779.38 = 729.93 : x
  2. Step 2: Convert to fraction form
    1,289.49/1,779.38 = 729.93/x
  3. Step 3: Cross multiply
    1,289.49x = 1,779.38 × 729.93
  4. Step 4: Simplify right side
    1,289.49x = 1,298,822.84
  5. Step 5: Solve for x
    x = 1,298,822.84/1,289.49
  6. Step 6: Final answer
    x = 1,007.24

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1.5x scale

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.