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Finding the Fourth Proportional to 1,124.49, 1,685.59 and 430.98

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Solution

The fourth proportional to 1,124.49, 1,685.59 and 430.98 is: 646.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.49 : 1,685.59 = 430.98 : x
  2. Step 2: Convert to fraction form
    1,124.49/1,685.59 = 430.98/x
  3. Step 3: Cross multiply
    1,124.49x = 1,685.59 × 430.98
  4. Step 4: Simplify right side
    1,124.49x = 726,455.58
  5. Step 5: Solve for x
    x = 726,455.58/1,124.49
  6. Step 6: Final answer
    x = 646.03

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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.