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Finding the Fourth Proportional to 1,369.48, 1,888.68 and 1,089.40

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Solution

The fourth proportional to 1,369.48, 1,888.68 and 1,089.40 is: 1,502.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.48 : 1,888.68 = 1,089.40 : x
  2. Step 2: Convert to fraction form
    1,369.48/1,888.68 = 1,089.40/x
  3. Step 3: Cross multiply
    1,369.48x = 1,888.68 × 1,089.40
  4. Step 4: Simplify right side
    1,369.48x = 2,057,527.99
  5. Step 5: Solve for x
    x = 2,057,527.99/1,369.48
  6. Step 6: Final answer
    x = 1,502.42

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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.