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Finding the Fourth Proportional to 1,032.16, 1,424.70 and 639.76

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Solution

The fourth proportional to 1,032.16, 1,424.70 and 639.76 is: 883.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,032.16 : 1,424.70 = 639.76 : x
  2. Step 2: Convert to fraction form
    1,032.16/1,424.70 = 639.76/x
  3. Step 3: Cross multiply
    1,032.16x = 1,424.70 × 639.76
  4. Step 4: Simplify right side
    1,032.16x = 911,466.07
  5. Step 5: Solve for x
    x = 911,466.07/1,032.16
  6. Step 6: Final answer
    x = 883.07

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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.