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Finding the Fourth Proportional to 1,005.88, 1,507.76 and 421.18

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Solution

The fourth proportional to 1,005.88, 1,507.76 and 421.18 is: 631.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.88 : 1,507.76 = 421.18 : x
  2. Step 2: Convert to fraction form
    1,005.88/1,507.76 = 421.18/x
  3. Step 3: Cross multiply
    1,005.88x = 1,507.76 × 421.18
  4. Step 4: Simplify right side
    1,005.88x = 635,038.36
  5. Step 5: Solve for x
    x = 635,038.36/1,005.88
  6. Step 6: Final answer
    x = 631.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.