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Finding the Fourth Proportional to 1,251, 1,875.98 and 429.35

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Solution

The fourth proportional to 1,251, 1,875.98 and 429.35 is: 643.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251 : 1,875.98 = 429.35 : x
  2. Step 2: Convert to fraction form
    1,251/1,875.98 = 429.35/x
  3. Step 3: Cross multiply
    1,251x = 1,875.98 × 429.35
  4. Step 4: Simplify right side
    1,251x = 805,440.49
  5. Step 5: Solve for x
    x = 805,440.49/1,251
  6. Step 6: Final answer
    x = 643.84

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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.