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Finding the Fourth Proportional to 1,036.85, 1,430.19 and 815.72

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Solution

The fourth proportional to 1,036.85, 1,430.19 and 815.72 is: 1,125.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.85 : 1,430.19 = 815.72 : x
  2. Step 2: Convert to fraction form
    1,036.85/1,430.19 = 815.72/x
  3. Step 3: Cross multiply
    1,036.85x = 1,430.19 × 815.72
  4. Step 4: Simplify right side
    1,036.85x = 1,166,627.44
  5. Step 5: Solve for x
    x = 1,166,627.44/1,036.85
  6. Step 6: Final answer
    x = 1,125.17

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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.