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Finding the Fourth Proportional to 1,010.42, 1,515.57 and 279.98

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Solution

The fourth proportional to 1,010.42, 1,515.57 and 279.98 is: 419.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.42 : 1,515.57 = 279.98 : x
  2. Step 2: Convert to fraction form
    1,010.42/1,515.57 = 279.98/x
  3. Step 3: Cross multiply
    1,010.42x = 1,515.57 × 279.98
  4. Step 4: Simplify right side
    1,010.42x = 424,329.29
  5. Step 5: Solve for x
    x = 424,329.29/1,010.42
  6. Step 6: Final answer
    x = 419.95

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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.