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Finding the Fourth Proportional to 1,013.19, 1,519.74 and 420.14

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Solution

The fourth proportional to 1,013.19, 1,519.74 and 420.14 is: 630.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.19 : 1,519.74 = 420.14 : x
  2. Step 2: Convert to fraction form
    1,013.19/1,519.74 = 420.14/x
  3. Step 3: Cross multiply
    1,013.19x = 1,519.74 × 420.14
  4. Step 4: Simplify right side
    1,013.19x = 638,495.96
  5. Step 5: Solve for x
    x = 638,495.96/1,013.19
  6. Step 6: Final answer
    x = 630.18

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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.