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Finding the Fourth Proportional to 1,036.43, 1,430.66 and 687.23

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Solution

The fourth proportional to 1,036.43, 1,430.66 and 687.23 is: 948.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.43 : 1,430.66 = 687.23 : x
  2. Step 2: Convert to fraction form
    1,036.43/1,430.66 = 687.23/x
  3. Step 3: Cross multiply
    1,036.43x = 1,430.66 × 687.23
  4. Step 4: Simplify right side
    1,036.43x = 983,192.61
  5. Step 5: Solve for x
    x = 983,192.61/1,036.43
  6. Step 6: Final answer
    x = 948.63

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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.