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Finding the Fourth Proportional to 1,038.39, 1,432.62 and 645.09

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Solution

The fourth proportional to 1,038.39, 1,432.62 and 645.09 is: 890.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.39 : 1,432.62 = 645.09 : x
  2. Step 2: Convert to fraction form
    1,038.39/1,432.62 = 645.09/x
  3. Step 3: Cross multiply
    1,038.39x = 1,432.62 × 645.09
  4. Step 4: Simplify right side
    1,038.39x = 924,168.84
  5. Step 5: Solve for x
    x = 924,168.84/1,038.39
  6. Step 6: Final answer
    x = 890.00

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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.