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Finding the Fourth Proportional to 1,020.62, 1,530.95 and 290.25

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Solution

The fourth proportional to 1,020.62, 1,530.95 and 290.25 is: 435.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.62 : 1,530.95 = 290.25 : x
  2. Step 2: Convert to fraction form
    1,020.62/1,530.95 = 290.25/x
  3. Step 3: Cross multiply
    1,020.62x = 1,530.95 × 290.25
  4. Step 4: Simplify right side
    1,020.62x = 444,356.79
  5. Step 5: Solve for x
    x = 444,356.79/1,020.62
  6. Step 6: Final answer
    x = 435.38

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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.