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Finding the Fourth Proportional to 918.13, 1,377.42 and 430.62

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Solution

The fourth proportional to 918.13, 1,377.42 and 430.62 is: 646.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.13 : 1,377.42 = 430.62 : x
  2. Step 2: Convert to fraction form
    918.13/1,377.42 = 430.62/x
  3. Step 3: Cross multiply
    918.13x = 1,377.42 × 430.62
  4. Step 4: Simplify right side
    918.13x = 593,137.71
  5. Step 5: Solve for x
    x = 593,137.71/918.13
  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.