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Finding the Fourth Proportional to 1,010.25, 1,515.20 and 279.63

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Solution

The fourth proportional to 1,010.25, 1,515.20 and 279.63 is: 419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.25 : 1,515.20 = 279.63 : x
  2. Step 2: Convert to fraction form
    1,010.25/1,515.20 = 279.63/x
  3. Step 3: Cross multiply
    1,010.25x = 1,515.20 × 279.63
  4. Step 4: Simplify right side
    1,010.25x = 423,695.38
  5. Step 5: Solve for x
    x = 423,695.38/1,010.25
  6. Step 6: Final answer
    x = 419.40

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1.5x scale

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.