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Finding the Fourth Proportional to 763.90, 1,054.27 and 639.34

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Solution

The fourth proportional to 763.90, 1,054.27 and 639.34 is: 882.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.90 : 1,054.27 = 639.34 : x
  2. Step 2: Convert to fraction form
    763.90/1,054.27 = 639.34/x
  3. Step 3: Cross multiply
    763.90x = 1,054.27 × 639.34
  4. Step 4: Simplify right side
    763.90x = 674,036.98
  5. Step 5: Solve for x
    x = 674,036.98/763.90
  6. Step 6: Final answer
    x = 882.36

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1.5x scale

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.