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Finding the Fourth Proportional to 1,663.40, 2,494.91 and 430.71

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Solution

The fourth proportional to 1,663.40, 2,494.91 and 430.71 is: 646.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,663.40 : 2,494.91 = 430.71 : x
  2. Step 2: Convert to fraction form
    1,663.40/2,494.91 = 430.71/x
  3. Step 3: Cross multiply
    1,663.40x = 2,494.91 × 430.71
  4. Step 4: Simplify right side
    1,663.40x = 1,074,582.69
  5. Step 5: Solve for x
    x = 1,074,582.69/1,663.40
  6. Step 6: Final answer
    x = 646.02

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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.