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Finding the Fourth Proportional to 1,123.70, 1,685.60 and 430.70

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Solution

The fourth proportional to 1,123.70, 1,685.60 and 430.70 is: 646.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.70 : 1,685.60 = 430.70 : x
  2. Step 2: Convert to fraction form
    1,123.70/1,685.60 = 430.70/x
  3. Step 3: Cross multiply
    1,123.70x = 1,685.60 × 430.70
  4. Step 4: Simplify right side
    1,123.70x = 725,987.92
  5. Step 5: Solve for x
    x = 725,987.92/1,123.70
  6. Step 6: Final answer
    x = 646.07

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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.