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Finding the Fourth Proportional to 1,036.74, 1,430.73 and 643.89

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Solution

The fourth proportional to 1,036.74, 1,430.73 and 643.89 is: 888.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.74 : 1,430.73 = 643.89 : x
  2. Step 2: Convert to fraction form
    1,036.74/1,430.73 = 643.89/x
  3. Step 3: Cross multiply
    1,036.74x = 1,430.73 × 643.89
  4. Step 4: Simplify right side
    1,036.74x = 921,232.74
  5. Step 5: Solve for x
    x = 921,232.74/1,036.74
  6. Step 6: Final answer
    x = 888.59

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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.