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Finding the Fourth Proportional to 1,077.50, 1,487.14 and 815.06

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Solution

The fourth proportional to 1,077.50, 1,487.14 and 815.06 is: 1,124.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.50 : 1,487.14 = 815.06 : x
  2. Step 2: Convert to fraction form
    1,077.50/1,487.14 = 815.06/x
  3. Step 3: Cross multiply
    1,077.50x = 1,487.14 × 815.06
  4. Step 4: Simplify right side
    1,077.50x = 1,212,108.33
  5. Step 5: Solve for x
    x = 1,212,108.33/1,077.50
  6. Step 6: Final answer
    x = 1,124.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.