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Finding the Fourth Proportional to 1,013.79, 1,520.73 and 429.05

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Solution

The fourth proportional to 1,013.79, 1,520.73 and 429.05 is: 643.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.79 : 1,520.73 = 429.05 : x
  2. Step 2: Convert to fraction form
    1,013.79/1,520.73 = 429.05/x
  3. Step 3: Cross multiply
    1,013.79x = 1,520.73 × 429.05
  4. Step 4: Simplify right side
    1,013.79x = 652,461.60
  5. Step 5: Solve for x
    x = 652,461.60/1,013.79
  6. Step 6: Final answer
    x = 643.59

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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.