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Finding the Fourth Proportional to 1,354.65, 2,031.99 and 430.20

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Solution

The fourth proportional to 1,354.65, 2,031.99 and 430.20 is: 645.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.65 : 2,031.99 = 430.20 : x
  2. Step 2: Convert to fraction form
    1,354.65/2,031.99 = 430.20/x
  3. Step 3: Cross multiply
    1,354.65x = 2,031.99 × 430.20
  4. Step 4: Simplify right side
    1,354.65x = 874,160.48
  5. Step 5: Solve for x
    x = 874,160.48/1,354.65
  6. Step 6: Final answer
    x = 645.31

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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.